How to shorten URL

Hi, may i know how to shorten url. Because i need to do google adwords, but the url is too long and google did not accept it. Please help.

Here is my url: http://saigonbuy.vn/?term=bang-viet&s=&url=ajax_search&post_type=product&taxonomy=product_cat

Have you tried googling “How to shorten URL”?