Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
sach thu » sach thue, sach thieu, sach tham
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
cac xuc » cam xuc, chat xuc, cac cuoc
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, xach tay
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
cua cu » cua chu, cua cau, cua su

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

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