Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
dinh tri » chinh tri
sach ky » sac ky, sach ty, sach kem
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va dinh » van dinh, va kinh, va tinh
luc va » duc va, tuc va, loc va
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cau luc va dinh tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) OR (hieu va)) cau luc va dinh tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cau luc va dinh tri cua te".
• Adding a wildcard symbol may retrieve word variants: toc ((sach ky) OR (sach y)) tang xa hoi. ((hieu van) or (hieu va)) cau luc va dinh tri cua te*.