I'm struggling to find replays with specific builds.
Right now I'm searching for blink stalkers into dark templars, but my question is generic.
Check sc2replayed There is some fiters 'by strategy' (I didn't managed to found "blink stalkers" but probably just "stalkers" will be fine for start) and you can search by tags / description provided by players.
Plus, filter replays base by game length - blink stalkers and DT takes a long time to establish so replay cannot be shorter then 7 (it's a random number) minutes.
Another option, as Wipqozn said - if you search for common build replay - it's probably located nearby build order description.
Please, if you found that liquipedia build order description doesn't contain replays at all and you found them in other place - contribute to community by adding this replay to liquipedia!
If just videos of these strategies being executed is sufficient, two general ways to achieve it are
General online search for videos
Google video search / youtube search with the strategy description as query.
Open the relevant page for a strategy in the Liquipedia. At the very bottom of the page there will often be a few links to videos of pro-level games where that strategy has been used at the bottom of the page. If you want the actual replay, and not just a video, you can use the video name to search for the replay file.
For example, at the bottom of the liquipedia page for DT rush there's a link to a video called "HongunPrime.WE vs TSL.Fruitdealer" where that strategy was used.