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
nang tai » hang tai, tang tai, sang tai
nang mai » nang ma, lang mai, nang cai
sach ty » sach y, sach tu, sach thu
cac xuc » cac nuoc, chat xuc, cac cuoc
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty ((nang mai) or (nang tai)) 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: su sach ty ((nang mai) OR (nang tai)) hoi. hieu hien ((cac xuc) OR (cam xuc)) van hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach ty ((nang mai) or (nang tai)) hoi. hieu hien ((cac xuc) or (cam xuc)) van hanh vai cua viet*.