Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
cam truc » cau truc, nam truc, lam truoc
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang o » nang co, nang ho, nang ro
va cam » va cham, va cac, va cao
o hai » co hai, so hai, o lai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang o hai. lieu va cam truc va hanh vai ((cua triet) OR (cua viet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang o hai. lieu va cam truc va hanh vai ((cua triet) or (cua viet))~".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang o hai. lieu va cam truc va hanh vai ((cua triet) or (cua viet))*.