Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nam tu » nam thu, nam thuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang xa hoi. hieu van ((nam truc) or (nam tu)) va hanh vi ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu van ((nam truc) OR (nam tu)) va hanh vi ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu van ((nam truc) or (nam tu)) va hanh vi ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu van ((nam truc) or (nam tu)) va hanh vi ((cua tre) OR (cuu tre))*.