Perhaps you should try some spelling variations:
ban hang » ngan hang
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam tuc » cam xuc, cam tu, nam thuc
tuc ban » thuc ban, truc ban, tu ban
vai cua » hai cua, lai cua, bai cua
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 ky nang xa hoi. hieu va cam tuc ban hang ((((vai cua) OR (dai cua))) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu va cam tuc ban hang ((((vai cua) OR (dai cua))) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu va cam tuc ban hang ((((vai cua) OR (dai cua))) or (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky nang xa hoi. hieu va cam tuc ban hang ((((vai cua) OR (dai cua))) or (di cua)) tre*.