Perhaps you should try some spelling variations:
ban hang » ngan hang
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ty xang xa hoi. hieu ve cam tuc ((gia thanh) or (ban hang)) hai ((cua tre) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty xang xa hoi. hieu ve cam tuc ((gia thanh) OR (ban hang)) hai ((cua tre) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. hieu ve cam tuc ((gia thanh) or (ban hang)) hai ((cua tre) or (dau tren))*.