Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
chat huu » pham huu
hieu van » hieu va, thien van, lieu va
van chat » cao chat
huu ban » huu bang, huu han, cuu ban
sach ky » sac ky, sach y, sach ty
hanh de » hanh ve, hanh kem
tu sach » thu sach, su sach, te sach
anh de » anh d, anh ve, anh du
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: tu sach ky nang ((o hoi) or (o hai)). hieu van chat huu ban ((anh de) or (hanh de)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (o hai)). hieu van chat huu ban ((anh de) OR (hanh de)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (o hai)). hieu van chat huu ban ((anh de) or (hanh de)) cua triet*.