Perhaps you should try some spelling variations:
chat sac » chat va, chat ban, chat ran
van hanh » van thanh, ban hanh, van anh
van lang » van nang, va lang, van hang
so sach » so sanh, bo sach, co sach
hanh va » hang va, hanh vi
hat sac » mat sach, dat sach, ham sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, su sach, vu khach
su tien » su kien, su hien, tu tieng

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: ((so sach) OR (vu sach)) van lang xa hoi. hieu ve ((chat sac) OR (hat sac)) van hanh va su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (vu sach)) van lang xa hoi. hieu ve ((chat sac) OR (hat sac)) van hanh va su tien~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (vu sach)) van lang xa hoi. hieu ve ((chat sac) OR (hat sac)) van hanh va su tien*.