Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh lai » thanh hai, thanh lap, thanh loi
tru tang » tri tang, tru nang, tru tan
hieu van » hieu va, thien van, lieu va
sach tru » sach truc, sach thu, sach tu
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cam thu » nam thu, cac thu, ca thu
thu ban » thu hang
van cam » van nam, van lam, van cau
tang ma » mang may, tang van
cuu tre » cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 tru tang ma hoi. hieu van cam thu ban thanh lai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tru tang ma hoi. hieu van cam thu ban thanh lai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach tru tang ma hoi. hieu van cam thu ban thanh lai ((cua tre) or (cuu tre))*.