How to configure certain keywords to bring certain URL in Sharepoint Search?

We have about 20 sharepoint internal site. so when people type coffee, sugar, 开发者_Python百科it will show this webportal first (portal.foo.com/kitchensupplies) in the search. when people type computer, batteries, etc, then it will bring up this site first in the list (portal.foo.com/electronicsupplies)

does it call ranking keyword with site (or portal in this case)?

The functionality you are looking for is called Best Bets. Here's a TechNet article on how to add keyword terms with Best Bets.