Perhaps you should try some spelling variations:
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
va triet » va thiet, va trien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
hieu ve » hieu va, hieu van
cac tac » cac toc, cac bac, cac dac
tac van » tac vang, cac van, tac va
ve cac » va cac, vien cac
vi va » vi van, vai va, vu 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 sach ky ((dang xa) OR (dang xay)) hoi. hieu ve cac tac van hanh vi va triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((dang xa) or (dang xay)) hoi. hieu ve cac tac van hanh vi va triet*.