No matter where you're searching, you will need to pick out the most important keywords. These are generally nouns.

How does a college education affect a retail manager's salary?

Other related words might be:

KEYWORD	NARROWER TERMS	BROADER TERMS
College education	Philadelphia University, Bachelor's degree	training, instruction, schooling
Retail	Target, Jones New York, apparel retailer	occupation, vocation, business
Manager	supervisor, managerial, management	person,  profession, career
Salary	pension, wage, wages, paycheck, take-home pay	compensation, contract, income, payment

The list you make will help you search for your topic. Note that both narrow and broad terms are included. When you brainstorm related words, be sure to include everything you can think of. More about searching for your topic is in the modules on Using the Catalog, Finding Articles, and Using the Web.