SYMPTOM:
When searching for an element in a project through Strategy Web 9.x , the Quick Search does not return any results. It works for some elements but not the others.
CAUSE:
The quick search index is not up to date with the objects that were newly created.
For more details on quick search please refer to:
KB41444: New Quick Search feature in MicroStrategy 9.3.0 Web
ACTION:
Disable quick search to delete the old indexes then enable quick search again and update the Indexes.

Please Refer to the following Technotes for additional guidance:
KB40303: How to disable Quick Search in MicroStrategy 9.3.0 Web
KB41443: How to enable quick search in MicroStrategy 9.3.0 Web