Perhaps you should try some spelling variations:
nguoi ban » nguoi san, nguoi dan, nguoi ba
cap nguoi » ca nguoi, gap nguoi, giap nguoi
ban hang » ngan hang
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
su sac » su sach, su xac
su cac » tu cac, su cao, su can
ve cap » ve cac, le cap, ve cai
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: ((su sac) or (su cac)) ky lang xa hoi. hieu ve cap nguoi ban hang ((di cua) OR (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky lang xa hoi. hieu ve cap nguoi ban hang ((di cua) OR (dai cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su cac)) ky lang xa hoi. hieu ve cap nguoi ban hang ((di cua) OR (dai cua)) tre*".