Finding is the completion of searching.
If you might not succeed in finding something, call the feature “Search”. For example text search in an editor can fail due to no matches – then calling it “Find” would be lying.
On the other hand: in an established job searching site, you can say “Find a PHP job” because you know that for (almost) anything your users want, there will be offerings. This also makes it sound confident, positive and energetic.