both suggestions for commons categories and wikidata items are vert finicky. When a category has a "-" isted of a space, é insted of e, or event upercase mismatch is stoping any suggestion from apearin. this is very anoying and should be fixed. there should be a fuzzy macht. look into the api documentation and the different apis on the wiki projects. maybe there is a search api that is more effective. research how this should be done and improve both category and item suggestions/search