Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, doanh van, dang van
thuc day » thuc dan, thuc vat
danh va » doanh va, hanh va, anh va
sach tu » sach thu, cach tu, sach ty
te sach » toc sach
tu nang » tru nang, tu nong, tu nano
co hoi » co hoc
qua am » quan am, qua ap, cua am

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nang ((co hoi) OR (co loi)). hieu qua am thuc day ((danh vai) OR (danh va)) cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nang ((co hoi) or (co loi)). hieu qua am thuc day ((danh vai) OR (danh va)) cua triet~".
• Adding a wildcard symbol may retrieve word variants: te sach tu nang ((co hoi) or (co loi)). hieu qua am thuc day ((danh vai) OR (danh va)) cua triet*.