Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
cam duc » cam xuc, cao duc, pham duc
cua tre » cua te, cua triet, dua tren
duc ban » duc tan, duc van, dua ban
cuu tre » cau tren, cau treo
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cam » va cham, va cac, va cao

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 thue)) nang xa hoi. hieu va cam duc ban thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thue)) nang xa hoi. hieu va cam duc ban thanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thue)) nang xa hoi. hieu va cam duc ban thanh vi ((cua tre) or (cuu tre))*.