Perhaps you should try some spelling variations:
cua triet » cua viet, su 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
va triet » va thiet, va trien, ve triet
thi hanh » thi thanh
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
xa hanh » xa thanh, xa khanh, va hanh
hanh xa » hanh va, hanh ma, hanh xu
cac toc » cac toi, cac nuoc, cac thoi

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 xa hoi. hieu va ((cac tuc) or (cac toc)) xa hanh vai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thi hanh xa hoi. hieu va ((cac tuc) OR (cac toc)) xa hanh vai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach thi hanh xa hoi. hieu va ((cac tuc) or (cac toc)) xa hanh vai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: toc sach thi hanh xa hoi. hieu va ((cac tuc) or (cac toc)) xa hanh vai ((cua triet) OR (va triet))*.