Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
du va » dau va, tu va, su va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (lang xa)) hoi. hieu ve cac du va hanh vi ((cua tre) OR (va triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky ((nang xa) OR (lang xa)) hoi. hieu ve cac du va hanh vi ((cua tre) or (va triet))~".
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) OR (lang xa)) hoi. hieu ve cac du va hanh vi ((cua tre) or (va triet))*.