I have enabled and setup Lucene.Net on our website.  I've setup the site, groups, and content channels to be indexed.  The search result page has a Universal Search block that uses Wildcard search type.

When searching for a specific name like Alexa, most of the results that comes back are proper with items that has the word Alexa in the title or content.  However, it also return a couple of items that doesn't have Alexa anywhere in the title/content.

When searching for a specific title of a page, like Serve, it comes back with that page at the top of the results but it also comes back with a bunch of other pages, some has the word serve in the content but others that doesn't.

When searching for a 2-word phrase, some times the top result only has 1 of the words in the phrase, but there are results lowers down that has both words in the phrase.

Is there any ways to fine tune the results that comes back ?

Thanks.