Perhaps you should try some spelling variations:
ban hang » ngan hang
dang xay » dang van, van xay
vu sach » vu bach, su sach, vu khach
cam tuc » cam xuc, cam tu, nam thuc
doi cua » dai cua, hoi cua
vai cua » dai cua, hai cua, lai cua
tuc ban » thuc ban, truc ban, tu ban
qua cam » qua cham, qua cac, qua ca
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ky ((dang xa) or (dang xay)) hoi. hieu qua cam tuc ban hang ((vai cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((dang xa) OR (dang xay)) hoi. hieu qua cam tuc ban hang ((vai cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((dang xa) or (dang xay)) hoi. hieu qua cam tuc ban hang ((vai cua) or (doi cua)) tre*.