Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
su triet » su viet, su tien, ve triet
van hanh » ban hanh, van anh, van ban
dang xay » dang van, van xay
hai cuc » tai cuc, hai cua, thai cua
co sach » bo sach, cuon sach, hoc sach
sach ky » sac ky, sach y, sach ty
dang xa » lang xa, dang ha, dang va
qua hai » qua hoat
vi su » va su, ve su, ki su

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: co sach ky ((dang xa) OR (dang xay)) hoi. hieu qua hai cuc ((van hanh) OR (van thanh)) vi su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach ky ((dang xa) or (dang xay)) hoi. hieu qua hai cuc ((van hanh) OR (van thanh)) vi su triet~".
• Adding a wildcard symbol may retrieve word variants: co sach ky ((dang xa) or (dang xay)) hoi. hieu qua hai cuc ((van hanh) OR (van thanh)) vi su triet*.