It is common to search for a specific phrase with "quotation marks ". Most databases will recognize the using of quotation marks to search for two works together.
Examples: " "
"concentration camp"
"national socialism"
Phrase searching ensures that you won't be searching for the individuals words within the phrase, which could return a lot of irrelevant results.
Search for alternate forms of a work by truncating it and adding an asterisk *.
Example: *
genetic* returns:
genetic, genetics, genetically
Truncation BROADENS
You can use truncation to search for all suffixes on a root work. Be careful though, some complete words might be related to topics outside of your research interest.