Perhaps you should try some spelling variations:
cham hoi » cham voi, cham h'roi, pham hoai
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tai cua » thai cua, tai cuc, tri cua
cao hoi » cau hoi, co hoi, cao hoc
hieu vu » hieu va, hieu ve, hieu su
sac ky » sai ky
cam lo » nam lo, cam ly, cam o
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sac ky) OR (cac ky)) nang cao hoi. hieu vu ((cham hoi) or (cam lo)) van hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sac ky) OR (cac ky)) nang cao hoi. hieu vu ((cham hoi) OR (cam lo)) van hanh tai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sac ky) OR (cac ky)) nang cao hoi. hieu vu ((cham hoi) or (cam lo)) van hanh tai cua te*".