Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
vat dung » van dung, va dung, viet dung
cuu tre » cau tren, cau treo
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cua tre » cua te, cua triet, dua tren
dung co » dung cho, dung cong, dung cua
so sac » so sach, so dac
sac ky » cac ky, sai ky
nam tu » nam thu

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang xa hoi. hieu ve ((nam tu) OR (nam thuc)) vat dung co ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang xa hoi. hieu ve ((nam tu) OR (nam thuc)) vat dung co ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: so sac ky nang xa hoi. hieu ve ((nam tu) OR (nam thuc)) vat dung co ((cua tre) or (cuu tre))*.