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
dua ban » dia ban, qua ban, mua ban
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
van cam » van nam, van lam, van cau
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 sang ma hoi. hieu van cam ((dua ban) or (cua ban)) thanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu van cam ((dua ban) OR (cua ban)) thanh vai ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. hieu van cam ((dua ban) or (cua ban)) thanh vai ((cua tre) or (cua te))*.