Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
khanh vai » khanh van, hanh vi, hanh va
dat khanh » van khanh, duy khanh
toc sach » hoc sach, doc sach, thuoc sach
tai hanh » tai thanh, tai nhanh, thi hanh
sach tai » sach bai, sach tham, sach dao
ca viet » va viet, co viet, hoa viet
cac toc » cac toi, cac nuoc, cac thoi
cac tuc » cac tu, cac tac, cac nuoc
hieu va » lieu va, hieu qua
hanh ma » hanh mau, hanh may, hanh va
ma hoi » mai hoi, xa hoi, ma hoa

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