Magnet Downloader is the best tool on Android to search torrents.
KEY FEATURES
Search - Search torrents from multiple torrent websites with basic options like sorting, category specific search, pause or continue search, etc.
Download - Directly download torrent file or copy magnetic link from within the app.
Smart sort & filter - Perform sort & filter on search results from various websites to find the best torrent.
Search Groups - Create search groups to search only specific set of websites say only Popular websites, Alexa-Top ranked websites, etc.
History - Previous search queries & results are saved locally to avoid repeated queries.
Starred - Mark torrent as starred to easily access it later under starred section.
Configurable - Lot of options under setting to configure app to your liking.
Contextual actions - Contextual action are available everywhere and are accessed by long-pressing like long-pressing on torrent will open its original
