Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
hanh dai » hanh tai, hanh dao, vanh dai
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
mai hoi » mai khoi, lai hoi, mai doi
cac xuc » cac nuoc, chat xuc, cac cuoc
ty nang » ky nang, ty xang, ty hang
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 ((mai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh dai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang ((mai hoi) OR (dai hoi)). hieu hien ((cac xuc) OR (cam xuc)) van hanh dai cua viet.
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang ((mai hoi) or (dai hoi)). hieu hien ((cac xuc) or (cam xuc)) van hanh dai cua viet*.