Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van dung » van dong, xay dung, tin dung
dung dai » duong dai, dung tai, dung dat
sach ty » sach tu, sach thu, xach tay
qua cac » cua cac
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
mo hoc » mon hoc

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 ty) or (sach y)) nang ((mo hoc) OR (co hoc)). hieu qua cac tuc van dung dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach y)) nang ((mo hoc) OR (co hoc)). hieu qua cac tuc van dung dai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) or (sach y)) nang ((mo hoc) OR (co hoc)). hieu qua cac tuc van dung dai cua triet*".