Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thi » sach thu, sach tai, sach thieu
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
hanh cat » hanh cac, hanh cham, hanh luat
thi hanh » thi thanh
cat hoi » cau hoi, sat hoi, chat hoa
cac toc » cac toi, cac nuoc, cac thoi
xa hanh » xa thanh, xa khanh, va hanh
cac tu » cac thu, cach tu, cac du

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach thi hanh cat hoi. hieu qua ((cac tu) or (cac toc)) ((xa hanh) or (van hanh)) dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh cat hoi. hieu qua ((cac tu) OR (cac toc)) ((xa hanh) OR (van hanh)) dai cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh cat hoi. hieu qua ((cac tu) or (cac toc)) ((xa hanh) or (van hanh)) dai cua triet*.