Perhaps you should try some spelling variations:
ban hang » ngan hang
vu sach » vu bach, vu khach
tuc ban » thuc ban, truc ban, tu ban
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
su sach » so sach
va cam » va cham, va cac, va cao
di cua » doi cua, de cua, do cua

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) or (su sach)) ky dang xa hoi. hieu va cam tuc ban hang ((dai cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ky dang xa hoi. hieu va cam tuc ban hang ((dai cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ky dang xa hoi. hieu va cam tuc ban hang ((dai cua) or (di cua)) tre*.