Research is vocabulary driven. So think creatively about all possible terms, both broad and narrow, to use in your searches.
Concepts for "Information seeking":
Brainstorm terms for the population you've selected. Some examples:
• Lawyers OR attorneys OR counsel OR legal profession, etc
• Teachers OR educators OR professors OR instructors, etc
• Undergraduates OR college students OR millennials OR generation y OR net generation, etc
Use both broad and narrow terms. If you're specifically researching the information behavior of pregnant women, you'll also want to search for how women seek information on health care in general.
To find background information on standard occupations, use the Occupational Outlook Handbook. If your user group is not covered in this source, consider finding background information in an encyclopedia.