Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lam » thanh lap, hanh kem, hanh va
chat duc » chat xuc, chat doc, chet duoc
van chat » cao chat
hieu van » hieu va, thien van, lieu va
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
co hai » co dai, co hoi, so hai
o hai » so hai, o lai, _ hai
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) OR (co hai)))). hieu van chat duc va hanh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (((o hai) OR (co hai)))). hieu van chat duc va hanh lam cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((o hoi) or (((o hai) OR (co hai)))). hieu van chat duc va hanh lam cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (((o hai) OR (co hai)))). hieu van chat duc va hanh lam cua triet*.