For your convenience the search definition process is consist of 4 steps:
Step 1: Keywords.
All entered words are combining with logical "and". So the search result for keywords "favorite" and "content" will be the files with a names which contain both of these keywords. If you want to search by precise phrase - you have to write it in quotes (ex.: "favorite content").
Step 2: What do you want to search for?
After you pointed keywords - choose search criteria. Four types of content are available:
Set values, which are necessary for the type you have chosen. There are 4 parameters available at "Let me choose" mode (primordially all of them set as default).