The dictionary is not as complete as online dictionaries like Naver or Youdao.
Some pretty basic words are missing "internet" and "poo" for example.
Support searching online dictionaries when no record found. At the vary least a link that will perform the search.
Additionally consider keeping a list of those not found. Maybe in the future entries can be added for these. Something like CCEDICT -> http://cc-cedict.org/editor/editor.php.