Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cua viet » ca viet, hoa viet, cua vat
dai hoi » dai hoc, dai hai, dai moi
sach ty » sach y, sach tu, sach thu
lai hoi » lai hoa, lai roi, mai hoi
cac xuc » cac nuoc, chat xuc, cac cuoc
ty nang » ky nang, ty xang, ty hang
vai cua » dai cua, hai cua, lai cua
vu sach » vu bach, su sach, vu khach

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang ((lai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ((lai hoi) OR (dai hoi)). hieu hien ((cac xuc) OR (cam xuc)) van hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ((lai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh vai cua viet*.