You have the following search options
Attention, all fields of the search masks are connected for search with the boolean AND. The number of results is unlimited. If you get to much results use the search mask field to restrict the new search.
There are differences between search in descriptive data (metadata) an search in full-text. A full-text search will only succeed, if the object is indexed. Pictures, Videos and some parts of pdf-files can not be indexed. They are searchable by metadata.
Keep in mind that search strings must have at least three characters. You can use an asterisk * as a wildcard. The search is case sensitive.