Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dieu hien » dieu khien, dieu kien, bieu hien
cua viet » ca viet, hoa viet, cua vat
thanh vi » hanh vi, thanh va, thanh ve
nang mai » nang ma, nang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
sach ty » sach tu, sach thu, xach tay
cac xuc » cac nuoc, chat xuc, cac cuoc
vi cua » vai cua, di 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 y)) nang mai hoi. dieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang mai hoi. dieu hien ((cac xuc) OR (cam xuc)) van thanh vi cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach y)) nang mai hoi. dieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) OR (sach y)) nang mai hoi. dieu hien ((cac xuc) or (cam xuc)) van thanh vi cua viet*.