Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
cam truc » cau truc, nam truc, lam truoc
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, su sach, tu cach
hieu ve » hieu va, hieu van
ki nang » ky nang
te sach » toc sach
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
o hoi » co hoi, o hoc, o hai

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) OR (te sach)) ki nang o hoi. hieu ve cam truc va hanh va ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ki nang o hoi. hieu ve cam truc va hanh va ((cua triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ki nang o hoi. hieu ve cam truc va hanh va ((cua triet) or (su triet))*".