Perhaps you should try some spelling variations:
dua tren » dung tren
hanh vai » hanh vi, hanh va, hanh tai
cuu tre » cua tre, cau tren, cau treo
xa hanh » xa thanh, xa khanh, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van cam » van lam, van cau, van dam
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa

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 hoi. hieu ((van cam) OR (van nam)) tuc xa hanh vai ((cuu tre) or (dua tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang ma hoi. hieu ((van cam) OR (van nam)) tuc xa hanh vai ((cuu tre) OR (dua tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky tang ma hoi. hieu ((van cam) OR (van nam)) tuc xa hanh vai ((cuu tre) or (dua tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang ma hoi. hieu ((van cam) OR (van nam)) tuc xa hanh vai ((cuu tre) or (dua tren))*.