The trick I use is to put the comma (",") at the end of the ticker.
I think I got the idea from someone’s suggestion on here. It does not always work, but it improves the success rate (ocassionally the ticker is still quite low down).
I have definitely searched for tickers before (without the comma) that gave a long list of results, with the ticker being one of the last ones.
There have been several app updates but tickers have not yet reappeared. I hope this is still planned to happen as I am unlikely to succeed with a request to Vanguard that they change the names of their funds to make them more easily distinguishable. I am on Version 5.6.8.2