1834 Samuel Manns & 1838 Eliza Cole/1839 Mary Ann Stephens (General)

by Jefff , West London, Middlesex, Saturday, November 17, 2018, 16:54 (2197 days ago) @ caroleigh

My rather quicker search rather confirms your thoughts Caroleigh.
Tried searching various family members using FamilySearch (and limited access to FMP & Ancestry), especially the youngest but no luck, either in Dymock area or anywhere else. Definitely looks like they are missing off the 1881, the only MANNS family I can find in the area is;

1881
Dymock, Gloucestershire, England
Household Role Sex Age Birthplace
William Manns Head M 31 Farm Labourer. Newent, Gloucestershire, England
Eliza Manns Wife F 27 Dymock, Gloucestershire, England
Emaley Manns Daughter F 5 Dymock, Gloucestershire, England
Charles Manns Son M 4 Dymock, Gloucestershire, England
Annie Manns Daughter F 2 Dymock, Gloucestershire, England

Just for the record and as you know here's Samuel and family in other years; hard to imagine they moved away during 1881 but not impossible they were off "visiting" of course.

1871
Event Place Dymock, Gloucestershire, England
Household Role Sex Age Birthplace
Samuel Manns Head M 36 Ag lab. Kempley, Gloucestershire
Mary Ann Manns Wife F 32 Linton, Herefordshire
Clara Manns Daughter F 12 Dymock, Gloucestershire
George Stephens Son-in-law M 9 Dymock, Gloucestershire
Anne Stephens Daughter F 6 Dymock, Gloucestershire
Martha Manns Daughter F 3 Dymock, Gloucestershire
Eleanor Manns Daughter F 1 Dymock, Gloucestershire

1891
Notts Place, Kempley, Gloucestershire, England
Household Role Sex Age Birthplace
Samuel Manns Head M 57 Ag lab. Gloucestershire, England
Mary A Manns Wife F 52 Gloucestershire, England
Elisa Manns Daughter F 17 General Servant Domestic. Gloucestershire, England
Mary Manns Daughter F 14 Gloucestershire, England
Henry Manns Son M 10 Gloucestershire, England
Ensley S Manns Son M 5 Gloucestershire, England

The family were definitely in Dymock either side of the 1881 census;

Record_ID: 150236
Entry_Number: 41
Year: 1880
Month: Apr
Day: 29
Parents_Surname: MANNS
Child_Forenames: Henry
Fathers_Forenames: Samuel
Mothers_Forenames: Mary Ann
Mothers_Surname:
Residence: Dymock
Occupation: Labourer
Officiating_Minister:
Event: Baptism
Memoranda:
Notes:
Register_Reference: P125 IN 1/25
Page_Number: 6
Parish_Chapel: Dymock
Soundex: M520

Record_ID: 150334
Entry_Number: 139
Year: 1883
Month: Mar
Day: 4
Parents_Surname: MANNS
Child_Forenames: Eva Emily
Fathers_Forenames: Samuel
Mothers_Forenames: Mary Ann
Mothers_Surname:
Residence: Dymock
Occupation: Labourer
Officiating_Minister:
Event: Baptism
Memoranda: DOB 08/12/1882
Notes:
Register_Reference: P125 IN 1/25
Page_Number: 18
Parish_Chapel: Dymock
Soundex: M520

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Moving on, have you tried finding their neighbours in the 1871 and 1891 census' ?
Then try searching for these same neighbours and /or address in the 1881 - my guess is they won't be found, suspect that sheet of the Census no longer exists, but worth trying all the same.