Search uses weighted relevance, not just exact matches
When you type a query and press Search, the page ranks every sermon by a relevance score. Title matches are weighted highest, then pastor name, then tags, then verse references, then summaries, then transcript text. A sermon whose title matches "grace" will always rank above one that only mentions grace in a long transcript.
You can also pass multiple terms by separating them with commas. The search treats commas as AND — every comma-separated term must match somewhere in the sermon for it to appear in the results. "marriage, parenting" finds sermons that touch both, not sermons about either one.