Perhaps you should try some spelling variations:
ban hanh » ban hang
van lang » van nang, va lang, van hang
chat soc » chat hoc, chat doc, chat song
su sach » so sach
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
vu sach » vu bach, vu khach
su tien » su kien, su hien, tu tieng
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: ((su sach) OR (vu sach)) van lang xa hoi. hieu ve ((chat soc) OR (cham soc)) ban hanh vi su tien~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) van lang xa hoi. hieu ve ((chat soc) OR (cham soc)) ban hanh vi su tien~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) van lang xa hoi. hieu ve ((chat soc) OR (cham soc)) ban hanh vi su tien*.