Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
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 hoi. hieu va cam tu ((va hanh) OR (va thanh)) vi ((cua tre) or (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang xa hoi. hieu va cam tu ((va hanh) OR (va thanh)) vi ((cua tre) OR (va thiet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang xa hoi. hieu va cam tu ((va hanh) OR (va thanh)) vi ((cua tre) or (va thiet))".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang xa hoi. hieu va cam tu ((va hanh) OR (va thanh)) vi ((cua tre) or (va thiet))*.