Perhaps you should try some spelling variations:
dang van » hoang van, hang va
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
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 (dang van)) hoi. hieu va cam tu van hanh vi ((cua tre) or (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (dang van)) hoi. hieu va cam tu van hanh vi ((cua tre) OR (va triet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (dang van)) hoi. hieu va cam tu van hanh vi ((cua tre) or (va triet))*.