What are the academic subjects that might have information about your topic?
Knowing which subject databases to go to will give you better results.
In order to search effectively, it's important to break out the main concepts of your research question into keywords.
Research question: How might feedback increase employee productivity?
Break up your research question into keywords that represent the main concepts:
Search for each keyword, connected with an 'AND', indicating you want results that discuss all the concepts:
feedback AND employees AND productivity
In many databases, they provide three lines for you, for three different concepts: