Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, hanh tai, thanh lap
ban hanh » ban hang
cua tre » cua te, cuu tre, dua tren
xuc ban » duc ban, cuc ban, quoc ban
sach tu » sach thu, cach tu, sach ty
te sach » toc sach
hieu ve » hieu va, hieu van
tu nong » tu dong, tu cong, tu tong
ve cam » ve cham, ve cac, va cam
o hai » co hai, so hai, o lai
o hoi » co hoi, o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach tu nong ((o hoi) or (o hai)). hieu ve cam xuc ban hanh lai ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tu nong ((o hoi) OR (o hai)). hieu ve cam xuc ban hanh lai ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tu nong ((o hoi) or (o hai)). hieu ve cam xuc ban hanh lai ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach tu nong ((o hoi) or (o hai)). hieu ve cam xuc ban hanh lai ((cua tre) OR (cua triet))*.