Perhaps you should try some spelling variations:
bieu hien » dieu hien, dieu khien, bien phien
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cua viet » ca viet, hoa viet, cua vat
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach y, sach thu, xach tay
sach tu » sach thu, cach tu, sach uu
vai cua » dai cua, hai cua, lai cua

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) or (sach tu)) nang mai hoi. bieu hien ((cac nuoc) or (cam xuc)) van hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach tu)) nang mai hoi. bieu hien ((cac nuoc) OR (cam xuc)) van hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach tu)) nang mai hoi. bieu hien ((cac nuoc) or (cam xuc)) van hanh vai cua viet*.