I would like an option when viewing a book to search within just that book.  So if I'm doing something with Dungeon of the Mad Mage and I'm trying to remember something about a lich of lava or whatever, I can search within just that book to find results.  I often try to search rules within the PHB, DMG, or XGTE that I can't find quickly and have to sift through results from every publication.

Edit: Saw this was submitted to suggestions a year ago and still hasn't been done.  Don't  know how to delete the post.

Don't worry about deleting. Multiple threads is better than necro'ing old threads.

I also wish search was better and able to filter out results from different books and sort by relevance.

Quote from Centritan >>

I would like an option when viewing a book to search within just that book.  So if I'm doing something with Dungeon of the Mad Mage and I'm trying to remember something about a lich of lava or whatever, I can search within just that book to find results.  I often try to search rules within the PHB, DMG, or XGTE that I can't find quickly and have to sift through results from every publication.

Edit: Saw this was submitted to suggestions a year ago and still hasn't been done.  Don't  know how to delete the post.

 Depending on your browser, the browser might support it. CTRL+F will activate it on PCs. Won't help for all cases (like on your phone?), but I've used it a few times to find what I'm looking for. 

Edit: my android does have a find on page feature. It's not great, but it will help find key words. That's basically the browser part does, so you have to remember or luck into the right words sometimes, but better than nothing until better functionality is developed. 

That will help within a chapter, but something like DOTMM has over 23 chapters.