Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
kho tang » cao tang
sach kho » bach khoa, sach dao, sach nha
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
tang xa » trang xa, tang ma, lang xa
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa
va dao » ca dao
dao vi » dao voi, dao ve, dao va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach kho tang xa hoi. ((hieu ve) or (hieu qua)) cac tuc va dao vi ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach kho tang xa hoi. ((hieu ve) OR (hieu qua)) cac tuc va dao vi ((cua tre) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu sach kho tang xa hoi. ((hieu ve) or (hieu qua)) cac tuc va dao vi ((cua tre) or (su triet))*.