Why does 'Search Question' of the Answers module not show any results?
Have a look at Comment #1 in issue 1619676, which states:

One hypothesis: have you run cron?
The way content gets indexed is during cron runs ... not immediately when new content is created.

It could well be that &quot;in the meantime&quot; cron was run, which would explain why &quot;... the Search feature started working...&quot; (as in your comment).
Disclosure; I'm a co-maintainer of the Answers module.