On Doctoring MEDLINE searches, with reference librarian comments

The question was

[not stated]

1 :  exp Family planning/td [Trends]         {159}
2 :  limit 1 to (local holdings and human and english language         {103}
and yr=1990-1999)
3 :  Family planning/mt [Methods]         {251}
4 :  limit 3 to (local holdings and human and english language         {143}
and yr=1990-1999)
5 :  2 and 4         {9}
6 :  from 5 keep 1-9          { 9}

Reference Librarian comments

I can't quite fathom what you were trying to find. I'm glad you know
about the "explode" feature and the relevant subheadings, though.