Perhaps you should try some spelling variations:
luc tuan » luc luan, luc quan, luu tuan
cua viet » hoa viet, cua vat, cua dieu
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
ca viet » co viet, hoa viet, san viet
va viet » hoa viet, san viet, mai viet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
qua ca » qua cac, qua cua, qua cai
ca luc » cau luc, ca lua
anh vi » hanh vi, anh va, anh ve

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