Truncation searching increases the number of results returned and can be useful if searches are returning a small number of results.
In most databases that allow truncation searching the * is used at the end of the root of a word to find different endings of that root, e.g. genetic* finds genetic, genetics, genetically. Remember to check the help pages of any search tool used to check that truncation searching is supported.
Example: a search for genetics returned 1,424 results
Example: a search for genetic* returned 5,160,688 results