I'm always a bit surprised when I see someone do a search online and be disappointed to get either too few results or, more likely, too many irrelevant results. Most search sites have an "advanced search" feature which often solves those issues and others.
On my Serendipity35 tech learning blog, I wrote about using Google for better search. That's useful for yourself and is also something anyone who teaches should make sure their students know and use.
I want to note here an example of a vendor search. Most of us use Amazon to find books and media, but far fewer people use their advanced search feature.
Start by going to the Advanced Search on Amazon. From there I could set up a search for books on "HTML5" published after "2011", and available for the Kindle and get only those results.
After doing my advanced search, I can even limit the search further from the list provided in the left column on the results page. If I wanted the really new publications, I could choose to see only the titles published in the last 30 days.
Amazon's advanced search also works for music, TV, movies, magazines and toys and games.