Perhaps you should try some spelling variations:
hieu san » hieu van, hieu sau, chieu sang
san chay » san pham, van chat, dan chan
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cua tre » cuu tre, cua triet, dua tren
dua ban » dia ban, cua ban, qua ban
tu sach » thu sach, su sach, tu cach
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
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) OR (te sach)) ky tang ma hoa. hieu san chay dua ban hanh vai ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ma hoa. hieu san chay dua ban hanh vai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky tang ma hoa. hieu san chay dua ban hanh vai ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky tang ma hoa. hieu san chay dua ban hanh vai ((cua tre) or (cua te))*.