Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van anh
dang xa » dang xay, lang xa, dang va
dang ha » dong ha, dung ha, lang ha
sach ty » sach y, sach tu, sach thu
qua cac » cua cac
cac luc » cau luc, coc luc, cac nuoc
va hanh » va thanh, va danh, ban hanh
su sach » so sach, vu sach
vi cua » vai cua, di cua

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: su sach ty ((dang xa) OR (dang ha)) hoi. hieu qua cac luc ((va hanh) OR (van hanh)) vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty ((dang xa) OR (dang ha)) hoi. hieu qua cac luc ((va hanh) or (van hanh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: su sach ty ((dang xa) OR (dang ha)) hoi. hieu qua cac luc ((va hanh) or (van hanh)) vi cua triet*.