Q. Going over the way to use multiple search bars to limit results.

adding synonyms with or between them (ex. college students or university students or undergraduates) 

using the left pulldown to change AND to NOT and put words you don't want to see in the results (ex. marriage satisfaction NOT health) 

find keywords in specific places by changing Select a Field pulldown (ex. Author field: Satis Keyword: mother... this would find articles written by Satis on mothers)