Truncation allows you to search for a root form of a word and pick up any ending.
Politic* will retrieve
* A good idea is to use quotes around the words to be searched,. For example:"hearing aid" or hearing aid*"
Some databases automatically search for phrases or adjacent words. Some databases do not have this capability. Check the database Help screens for details. For example:
Keyword search: hearing aids
A database with phrase searching would yield:
Hearing aids for the elderly
A database without phrase searching could yield: AIDS and teenagers hearing before the Select Committee on Children, Youth, and Families.