Use your area, topic and question to create a list of keywords for your research.
Data searches generally depend on the title and data description for subject terms. Occasionally individual variables or questions may be searchable, but just because a word shows up in a question doesn't necessarily mean that the study deals with that topic.
The ICPSR search page, includes a search box where you can enter terms.
You can also browse ICPSR's Thematic Collections such as:
Next, we will look at important clues to help you decide whether a dataset is going to be useable for your purposes.