1) Use the AND connector to search for different concepts

     Example:  identification AND procedures AND assailants   

2) Use the OR connector to search for variant words for the same  concept

     Example:  crime OR criminals

Note: To use the AND connector and OR connector in a single search string use parenthesis around the similar words

    Example: (white collar crime* OR corporate computer fraud) AND whistleblowing

3) Use truncation to capture different possible endings for a word

     Example:  child* (captures child, children, childhood)