You can use M-x semanticdb-dump-all-table-summary to see the list of databases that will be searched from a given buffer. You can follow up with M-x semanticdb-find-test-translate-path to then make sure specific tables from the path are discovered correctly. Alternately, you can get a list of include files Semantic encountered, but could not find on disk using M-x semanticdb-find-adebug-lost-includes.
Call and output results of semanticdb-find-translate-path. In the displayed buffer, you can type <SPC> to expand items. With arg non-
nil, specify a brutish translation.
Translate the current path, then display the lost includes. Examines the variable
Lastly, you can test an explicit search term using this command: