Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
thanh tai » thanh hai, thanh toan, doanh tai
hieu van » hieu va, thien van, lieu va
van giao » nang giao, toan giao, dan gian
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
lang xa » lang ha, dang xay, lang van
duc gia » quoc gia

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 ma) or (lang xa)) hoi. hieu van giao 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 ma) OR (lang xa)) hoi. hieu van giao duc gia thanh tai ((cua triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) or (lang xa)) hoi. hieu van giao duc gia thanh tai ((cua triet) or (su triet))*.