From the article: "The crux is that while vector search is better along some axes than traditional search, it's not magic. Just like regular search, you'll end up with irrelevant or missing documents in your results."

RAG is often helpful and easy to add, but it's fundamentally search - not magic.

I find it helpful to look at the search results before feeding them into the model. Just like the "I'm feeling lucky" button on google doesn't always give the perfect answer. You may have to tweak your search query to improve the result.