Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cau triet » cau trieu, su triet, va triet
hieu van » hieu va, thien van, lieu va
nang xa » lang xa, nang ma, mang xa
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va hanh vi ((cau triet) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va hanh vi ((cau triet) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va hanh vi ((cau triet) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang xa) OR (nang x)) hoi. hieu van cam duc va hanh vi ((cau triet) or (cua triet))*.