Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
thanh va » thanh van, hanh va, thanh ha
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
sach ky » sac ky, sach y, sach ty
te sach » toc sach
duc ban » duc tan, duc van, duc man
va cham » va chat, va tham
hieu va » lieu va, hieu qua
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang
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 va cham ((duc ban) or (dua ban)) thanh va ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang ha hoi. hieu va cham ((duc ban) OR (dua ban)) thanh va ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ha hoi. hieu va cham ((duc ban) or (dua ban)) thanh va ((cua tre) or (cau tren))*.