Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ve triet » va trien, su triet
van hanh » van thanh, ban hanh, van anh
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
dam tu » nam tu, cam tu, tam tu
tu van » tu va
ve dam » ven dam, ke dam, va dam

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 ((lang xa) or (nang ma)) hoi. hieu ve dam 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 ((lang xa) OR (nang ma)) hoi. hieu ve dam tu van hanh vi ((cua triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((lang xa) or (nang ma)) hoi. hieu ve dam tu van hanh vi ((cua triet) or (ve triet))*.