Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
va triet » va trien, ve triet, cua triet
dang xay » dang van, van xay
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
dang xa » lang xa, dang ha, dang va
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
ve cac » va cac, vien cac
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 sach y ((dang xa) OR (dang xay)) hoi. hieu ve cac tuc van hanh vai ((va triet) OR (va thiet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((dang xa) or (dang xay)) hoi. hieu ve cac tuc van hanh vai ((va triet) OR (va thiet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((dang xa) or (dang xay)) hoi. hieu ve cac tuc van hanh vai ((va triet) OR (va thiet))*.