I created several packages of produced documents with embedded indexes in Acrobat 8. Using the advanced search option "Match any words" works great in Acrobat. However, the attorney only has Reader 9 installed on his computer, and it won't let him do select advanced searching features -- he presses Ctrl Shift F and the cursor remains in the small search window -- the drop down menu doesn't allow him to select the Advanced search popup like it does for other pdf files he's viewed in Reader 9. Advanced search worked in Reader 8, but since he's upgraded to Reader 9, he can't select advanced search.
an embedded index is applied to and works with one PDF document, not with multiple PDFs.
check each PDF to see that each has a valid embedded index.
the 'drop down' menu on the FIND tool does not give access to 'advanced search options'
ctrl+shift+f launchs the SEARCH panel where 'advanced search options' selection is found at foot of the search panel
do you see the SEARCH panel?
if not, do you see a toolbar button labeled 'search'?
if so, click the toolbar button (you may also need to click 'arrange windows' on the search panel)
fn1: if you need to search multiple pdfs simultaneously, you need to create a catalog index for all the target pdfs
fn2: if you need 'proximity' and 'stemming' searches (on one or more PDFs), you need to create a catalog index