Perhaps you should try some spelling variations:
nguoi san » nguoi tay, nguoi dao, nguoi ma
gap nguoi » gian nguoi, dao nguoi, tay nguoi
san hanh » san thanh, ban hanh, van hanh
doi cua » dai cua, hoi cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
di cua » dai cua, de cua, do cua
su sac » su sach, su cac, su xac
su can » su van, su cao, tu can
ve gap » viet gap

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 can)) ky nang xa hoi. hieu ve gap nguoi san hanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su can)) ky nang xa hoi. hieu ve gap nguoi san hanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su can)) ky nang xa hoi. hieu ve gap nguoi san hanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su can)) ky nang xa hoi. hieu ve gap nguoi san hanh ((di cua) OR (doi cua)) tre*.