Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
tham duc » pham duc, tham du, than duc
nang xa » nang x, lang xa, nang ma
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
cua tre » cua te, cuu tre, dua tren
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky

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

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