Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
sach ty » sach tu, sach thu, xach tay
lang xa » lang ha, dang xay, lang van
qua cam » qua cham, qua cac, qua ca
vai cua » dai cua, hai cua, lai cua
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ty) OR (sach y)) lang xa hoi. hieu qua cam ((tuc va) or (duc va)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ty) OR (sach y)) lang xa hoi. hieu qua cam ((tuc va) OR (duc va)) hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ty) OR (sach y)) lang xa hoi. hieu qua cam ((tuc va) or (duc va)) hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: so ((sach ty) OR (sach y)) lang xa hoi. hieu qua cam ((tuc va) or (duc va)) hanh vai cua triet*.