Perhaps you should try some spelling variations:
lang xay » dang xay, luong xay, lang xuan
va triet » va trien, ve triet, cua triet
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
lang xa » lang ha, dang xay, lang van
tac van » tac vang, cac van, tac va
tu sac » tu sach, tu cac, tu san
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
thiet » thieu

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 sac ky ((lang xa) OR (lang xay)) hoi. hieu ve cac tac van hanh vi ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((lang xa) or (lang xay)) hoi. hieu ve cac tac van hanh vi ((va triet) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang xa) or (lang xay)) hoi. hieu ve cac tac van hanh vi ((va triet) OR (va thiet))*.