1. If I remember correctly, the internal search requires more than 3 letters for a search term.
2. I have found using the search box but allowing for the google results usually works better, including searching for "duo" which provides a lot of relevant results on the forum.
3. If you can do better, do so. Otherwise quit crying about a platform that is free for you to use and paid and run by hobbyists, not full-time employees...