Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham duc » pham duc, cham soc, pham duy
thanh va » thanh van, hanh va, thanh ha
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cua triet, dua tren
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
cuu tre » cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi

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 ky tang ha hoi. hieu van cham duc ban thanh va ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ha hoi. hieu van cham duc ban thanh va ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ha hoi. hieu van cham duc ban thanh va ((cua tre) or (cuu tre))*.