Then..

Use a combination of these 3 steps

1) Search public torrent indexes individually

thepiratebay.org (.onion)

Example search > thepiratebay.org

1337x.to

Example search > 1337x.to

rarbg.to

Example search > rarbg.to

zooqle.com

Bt Tracker List Downloads

Example search > zooqle.com
More public torrent indexes @ /links/publicly-tracked-torrents/#indexes
2) Use a search engine like Torrentz2.eu
Note:Torrentz2.eu has recently removed all external torrent indexes and links from their site. However, the torrent hashes are still available, use one of the following chrome extensions to provide magnet/torrent links for the content indexed there
Torrentz2 Magnet Links + (.torrent + magnet links)
Magnet Links for Torrentz2 (magnet links only)

torrentz2.eu (.onion)

Example search > torrentz2.eu
More search engines @ /links/publicly-tracked-torrents/#searchengines
3) Search on Google (search for the name of the content + torrent)

google.com

Example search > google.com

Tips for Searching more Efficiently

1) Be as specific as possible with keywords

Vuze Tracker List Movies

2) When looking for specific content, limit the keywords to the most central word(s)

Free Bt Tracker List

3) Sort by size, date, peers (popularity)

Vuze Tracker List Movie Free

4) Search for the content by itselfandinside a large pack
5) If there are multiple releases with the same name from different years, include the year
More publicly tracked torrent search engines, indexes, trackers, etc @ /links/publicly-tracked-torrents/