Hi,

I have a task to improve SharePoint 2010 Search.

How to go about doing that?

Thanks.

Here's an article about how to enhance Search with Keywords, Synonyms, and Best Bets

http://technet.microsoft.com/en-us/library/hh133422(v=office.14).aspx

Using Thesaurus is a great way of improving or enhancing search in SP 2010. You can add alternate keywords (synonyms, aliases, aka) which can be used while searching common terms (say searching HR will bring in results for Human Resources).

Reference - http://code2care.org/pages/setup-synonyms-or-alias-or-thesaurus-in-sharepoint/