Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh tai » thanh hai, thanh toan, doanh tai
su triet » su viet, su tien, ve triet
cao duc » dao duc, cao suc, giao duc
duc gia » quoc gia
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
ve cao » va cao, ve bao, ve cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y ((nang xa) or (lang xa)) hoi. hieu ve cao duc gia thanh tai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang xa) OR (lang xa)) hoi. hieu ve cao duc gia thanh tai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang xa) or (lang xa)) hoi. hieu ve cao duc gia thanh tai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang xa) or (lang xa)) hoi. hieu ve cao duc gia thanh tai ((cua triet) OR (su triet))*.