Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
dinh tri » chinh tri
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
lua tre » luy tre, dua tren, luat tri
cua tre » cua te, cuu tre, cua triet
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
den va » dien va, den vai, den vay

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky lang xa hoi. ((hieu van) or (hieu va)) thai den va dinh tri ((lua tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky lang xa hoi. ((hieu van) OR (hieu va)) thai den va dinh tri ((lua tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky lang xa hoi. ((hieu van) or (hieu va)) thai den va dinh tri ((lua tre) or (cua tre))*.