Fetching best bets on the basis of synonyms

[Amit]

Hi,

I am writing a custom webpart for fetching best bets data using MOSS API.
I have been able to find the best bets links using keywords.
Used
Keyword.AllKeyWords[<Keyword term>] for fetching this.
But till now i have not been able to find the Best Bets data using synonyms
entered against a keyword.
i.e. while configuring Search Keywords i entered a keyword,3 synonyms
against this keyword and couple of best bets.

Now in my custom code when i search with this keyword i am able to get the
configured best bets,but when i search using synonym configured against
keyword it is not retrieving best bets for it.

This is happening perfectly in OOB web part.
Any pointers on how to achieve this in custom code?

Regards,
Amit