Perhaps you should try some spelling variations:
vat dung » van dung, va dung, viet dung
cong cua » cong cu, dong cua, huong cua
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
con cua » co cua, dong cua, long cua
hieu va » lieu va, hieu qua
so sac » so sach, so dac
tu vat » tu va, tu van, tu bat
nam tu » nam thu, nam thuc
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang xa hoi. ((hieu ve) OR (hieu va)) nam tu vat dung ((cong cua) or (con cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang xa hoi. ((hieu ve) OR (hieu va)) nam tu vat dung ((cong cua) OR (con cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sac ky nang xa hoi. ((hieu ve) OR (hieu va)) nam tu vat dung ((cong cua) or (con cua)) tre*".