Perhaps you should try some spelling variations:
nguoi san » nguoi tay, nguoi dao, nguoi ma
cai nguoi » ca nguoi, coi nguoi, cuoi nguoi
san hanh » san thanh, ban hanh, van hanh
hieu ve » hieu va, hieu van
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
ve cai » va cai, ve cac, ve tai
su cac » su cao, su can, eu cac
di cua » dai cua, doi cua, de cua
su sac » su sach, su xac

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