Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
qua cam » qua cham, qua cac, qua ca
sach tu » sach thu, cach tu, sach ty
xuc ban » duc ban, cuc ban, quoc ban
tu nang » tru nang, tu nong, tu nano
cua tre » cua te, cuu tre, dua tren
su sach » so sach, vu sach
hanh d » hanh de, anh d, hanh _
o hoi » co hoi, o hai, o hoa
o hoc » co hoc, mo hoc, so hoc

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 nang ((o hoi) OR (o hoc)). hieu qua cam xuc ban hanh d ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang ((o hoi) OR (o hoc)). hieu qua cam xuc ban hanh d ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu nang ((o hoi) OR (o hoc)). hieu qua cam xuc ban hanh d ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach tu nang ((o hoi) OR (o hoc)). hieu qua cam xuc ban hanh d ((cua tre) or (cua triet))*.