Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh va, hanh tai, hanh van
tu sach » thu sach, su sach, te sach
dai hoi » dai hoc, dai hai
dai moi » doi moi
qua cai » qua hai, qua cac, qua ca
cai tuc » cai tu, dai thuc, dai truc
y sang » _ sang, duy sang

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 y sang ((dai hoi) OR (dai moi)). hieu qua cai tuc xa ((hanh vai) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y sang ((dai hoi) OR (dai moi)). hieu qua cai tuc xa ((hanh vai) OR (hanh vi)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y sang ((dai hoi) OR (dai moi)). hieu qua cai tuc xa ((hanh vai) or (hanh vi)) cua triet*".