Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
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 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
cac xuc » cac nuoc, chat xuc, cac cuoc
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. dieu 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) OR (sach tu)) nang mai hoi. dieu hien ((cac xuc) OR (cam xuc)) van hanh vai cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach tu)) nang mai hoi. dieu hien ((cac xuc) 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. dieu hien ((cac xuc) or (cam xuc)) van hanh vai cua viet*.