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
sach ky » sac ky, sach ty, sach kem
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 ((sach ky) or (sach y)) 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 ((sach ky) OR (sach y)) 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 ky) or (sach y)) 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 ky) or (sach y)) nang o hai. lieu va cam truc va hanh vai ((cua triet) OR (cua viet))*.