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
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
su sac » su sach, su xac
ma hoi » mai hoi, xa hoi, ma hoa
su cac » tu cac, su cao, su can
va cai » va cac, va bai, va dai

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 nang ma hoi. hieu va cai nguoi san hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sac) OR (su cac)) ky nang ma hoi. hieu va cai nguoi san hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky nang ma hoi. hieu va cai nguoi san hanh vi ((cua tre) or (cuu tre))*.