Perhaps you should try some spelling variations:
cua triet » su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
sach thi » sach thu, sach tai, sach thieu
hanh vai » hanh vi, hanh va, hanh tai
cua viet » ca viet, hoa viet, cua vat
thi hanh » thi thanh
cac tuc » cac toc, cac tu, cac tac
cac toi » cac thoi
xa hanh » xa thanh, xa khanh, va hanh
hanh ca » hanh cac, hanh cat, hanh cua
ca hoi » cau hoi, cua hoi, xa hoi

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 ca hoi. hieu qua ((cac tuc) or (cac toi)) xa hanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh ca hoi. hieu qua ((cac tuc) OR (cac toi)) xa hanh vai ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh ca hoi. hieu qua ((cac tuc) or (cac toi)) xa hanh vai ((cua triet) or (cua viet))*.