Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, nang cao
ca viet » va viet, co viet, hoa viet
ma hoi » mai hoi, xa hoi, ma hoa
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) or (sach thu)) nang ma hoi. hieu hien ((cac nuoc) or (cam xuc)) van hanh vi ca viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang ma hoi. hieu hien ((cac nuoc) OR (cam xuc)) van hanh vi ca viet.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang ma hoi. hieu hien ((cac nuoc) or (cam xuc)) van hanh vi ca viet*.