Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
sach tai » sach bai, sach tham, sach dao
thanh xa » thanh ha, thanh va, thanh ba
sach thi » sach thu, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu ve » hieu va, hieu van
ve am » va am

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach thi) or (sach tai)) thanh xa hoi. hieu ve am thuc va hanh vai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach thi) OR (sach tai)) thanh xa hoi. hieu ve am thuc va hanh vai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach thi) or (sach tai)) thanh xa hoi. hieu ve am thuc va hanh vai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach thi) or (sach tai)) thanh xa hoi. hieu ve am thuc va hanh vai ((cua triet) OR (su triet))*.