Why doesn't r/exmuslim come up with some reddit searches?

How does the reddit search work? Sometimes I type in "ex muslim" to find this subreddit (weird I know), but it is never anywhere near the first results (not even on the first few pages). We do show up if I type in "exmuslim" as one word.

How can we change these results? It may be harder for people to find our sub, unless they type in "exmuslim" as one word.