When should you use quotation marks $("\text{'}")$ in library databases?

Never $--$ they won't change your search at all.

When you want the database to look for an exact phrase. For example, "human resource management".

Always $--$ around all words in your search. For example, "marketing" AND "human resource management".

When you have two similar words that you want the database to look for at the same time. For example, "marketing OR advertising".