Perhaps you should try some spelling variations:
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh va, hanh tai
cam truc » cau truc, nam truc, lam truoc
va hanh » van hanh, va thanh, va danh
tu bach » vu bach, tu cach, tu hach
truc va » thuc va, thuc vat, trung va
tu bac » tu ban, tu cac, tu bat
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.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu bac) or (tu bach)) ky nang o hai. lieu va cam truc va hanh vai ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bac) OR (tu bach)) 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 bac) or (tu bach)) ky nang o hai. lieu va cam truc va hanh vai ((cua triet) or (cua viet))*.