Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cuu tre » cua tre, cau tren, cau treo
va cam » va cham, va cac, va cao
cam tu » cam thu, nam tu, dam tu
thiet » thieu

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 (lang van)) hoi. hieu va cam tu va hanh vi ((cuu tre) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (lang van)) hoi. hieu va cam tu va hanh vi ((cuu tre) OR (va thiet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (lang van)) hoi. hieu va cam tu va hanh vi ((cuu tre) or (va thiet))*.