Use AND to narrow your search by combining your terms so that each search result contains all of the terms. For example, management AND leadership will retrieve results with both terms.
Use OR to broaden your search by combining search terms so that each result contains at least one of the terms. For example: “human resource management” OR "human resources" OR "HR management" finds results that contain any of these terms.
You can use NOT to exclude any terms so that each result does not include that term. For example, “human resource management” NOT "HR management" finds results that contains the term "human resource management" but not the term "HR management".
Searching for a phrase: Using phrases instead of singe word search terms will help reduce the number of results. You can search for a phrase by combining single search terms in quotation marks " ".
For example: "human resource management"
Using Widcards: Use wildcard symbols to create a search where there are unknown characters, multiple spellings or various endings.
For example: use organi?ation to find records containing organisation or organization.
For example: use labo#r to find all records containing labor or labour.
NB - This technique will not be recognized if used inside inverted commas " "
Using Truncation: Use Truncation when there are multiple spellings and various endings of search terms.
For example: use manag* to find the words manage, manager, management, managing, etc.
More info how to search EBSCO Discovery: EBSCO Discovery Help Files