I had the same problem. I search for Daewoo type "Wiki", and I only got 2 pages as a result, which didn't even have "Daewoo" in the title. The same search now gives more results, but still not all that I would expect.
Searching for "sony" gives 13 page hits in the wiki, obviously there are a lot more then 13 pages which mention Sony. Are the results perhaps getting limited to 2 pages?
The search engine is reindexing all content (newsposts, forum posts, and also the wiki). Since there’s a lot of content, it might take a while for everything to be in the index again.