Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thi » sach thu, sach thieu, sach tham
sach tai » sach bai, sach tham, sach dao
nam thuc » nam thuoc, nam thu, nam tu
hanh vai » hanh vi, hanh va, hanh tai
hanh xa » hanh va, hanh ma, hanh xu
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua

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

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