Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van thanh » ban thanh, van tuan
nang tai » hang tai, tang tai, sang tai
thanh di » thanh doi, thanh de, thanh do
cua viet » ca viet, hoa viet, cua dieu
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
tai hoi » tai khoi, dai hoi, tai hai
cac xuc » cac nuoc, chat xuc, cac cuoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang tai hoi. hieu hien ((cac xuc) or (cam xuc)) van thanh di ((cua viet) or (cua vat))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang tai hoi. hieu hien ((cac xuc) OR (cam xuc)) van thanh di ((cua viet) OR (cua vat)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang tai hoi. hieu hien ((cac xuc) or (cam xuc)) van thanh di ((cua viet) or (cua vat))*.