Perhaps you should try some spelling variations:
nguoi san » nguoi tay, nguoi dao, nguoi ma
viet gap » viet giao, viet phap, viet nam
san hanh » san thanh, ban hanh, van hanh
cua tre » cua te, cuu tre, cua triet
hanh di » hanh vi, hanh de, hang di
nang xa » nang x, lang xa, nang ma
di cua » dai cua, doi cua, de cua
su sac » su sach, su cac, su xac
su can » su van, su cao, tu can

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) OR (viet gap)) nguoi san hanh di 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) OR (viet gap)) nguoi san hanh di 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) OR (viet gap)) nguoi san hanh di cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su can)) ky nang xa hoi. hieu ((ve gap) OR (viet gap)) nguoi san hanh di cua tre*.