Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
cham duc » pham duc, cham soc, pham duy
tan hanh » tan thanh, tang hanh, toan hanh
hanh dai » hanh tai, hanh dao, vanh dai
sach tu » cach tu, sach ty, sach uu
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
x hoi » xa hoi, o hoi, 5 hoi

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 tu) OR (sach thu)) nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tu) OR (sach thu)) nang ((x hoi) OR (x ho)). hieu ve cham duc tan hanh dai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach tu) OR (sach thu)) nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach tu) OR (sach thu)) nang ((x hoi) or (x ho)). hieu ve cham duc tan hanh dai cua triet*.