Could you explain what you mean by "keywords"? You may mean shortcut keys. As I said in another post - check the PDF manual that was installed with your software.
It's not "keyword", it's "Key Words". That's a big difference. "Keyword" usually means linking a word with an action. In this case, Key Words are simply words you use to identify the type of project you are making. This might be such as Aida, 14 Count; or Evenweave 28 count. It could include a color, or a season.
It's not often used that I have seen. It's just a way to identify or categorize your design.
So, you're not able to use it to search for all the projects that has the same key word? Say I want to find all the projects that are baby announcement, how would I do that?
I have no idea. I do not think it is possible. These are just tags that are included when you print the pattern as far as I know.
There are certain parts of the software (under Online) where you can search by the keywords but these are pre-selected patterns (and none that I saw just now were free).