Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
ve triet » va trien, su triet
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve nam » he nam, va nam, le nam
nam tu » nam thu, nam thuc
tu van » tu va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((nang xa) or (nang ma)) hoi. hieu ve nam tu van hanh vi ((cua triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (nang ma)) hoi. hieu ve nam tu van hanh vi ((cua triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (nang ma)) hoi. hieu ve nam tu van hanh vi ((cua triet) or (ve triet))*.