cái du – (gai zoo) umbrella
To continue learning Vietnamese online start with phrase list found at the NY Public Library. This Wanna Learn / Geocities page has some free words and phrases listed. It was one of few I could find online for free though you won’t get far. Rosetta Stone offers audio and web courses for a fee and there’s always the opportunity to take a Vietnamese language class in Hanoi, Vietnam with CIEE. For those flying through the country for just a few short days pick up the phrasebook.