Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
qua ban » cua ban, qua quan
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
dua ban » dia ban, cua ban, mua ban
van lam » van nam
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang ma hoa. hieu van lam ((dua ban) or (qua ban)) ((thanh vai) or (thanh san)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoa. hieu van lam ((dua ban) OR (qua ban)) ((thanh vai) OR (thanh san)) cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ma hoa. hieu van lam ((dua ban) or (qua ban)) ((thanh vai) or (thanh san)) cua tre*.