It's also probably worth noting that Lithium recognises that search currently needs improvement and has refinement on the roadmap.
We find on Workshop that members have been trained by Google to search using sentences and that Lithium doesn't cope, preferring keywords. For example, searching How to fix a hole in the wall? is more likely to present a post entitled How do I fix a hole in the bathtub than How to repair cracked walls.
Until Lithium improve search, educating your community members on how best to utilise the search engine might be your best bet.
All the very best with your launch.
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