Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va viet » hoa viet, san viet, mai viet
luc van » luoc van, luu van, duc van
lang xa » lang ha, dang xay, lang van
van anh » van thanh, tuan anh, van minh
anh vi » hanh vi, anh va, anh ve
san ky » sang ky, van ky, ban ky
qua ca » qua cac, qua cua, qua cai
dan ky » van ky
ca luc » cau luc, ca lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((san ky) OR (dan ky)) lang xa hoi. hieu qua ca luc van anh vi ((cua viet) or (va viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((san ky) OR (dan ky)) lang xa hoi. hieu qua ca luc van anh vi ((cua viet) OR (va viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((san ky) OR (dan ky)) lang xa hoi. hieu qua ca luc van anh vi ((cua viet) or (va viet))".
• Adding a wildcard symbol may retrieve word variants: tu ((san ky) OR (dan ky)) lang xa hoi. hieu qua ca luc van anh vi ((cua viet) or (va viet))*.