Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
mot chieu » doi chieu, ho chieu
khach dan » khach san, khach hang, nhac dan
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
toan cao » toan ban, toan tap
dan va » doan va, dan ca, ban va

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: ((mot chieu) OR (theo chieu)) sang - khach dan va nhung ((cong dan) OR (cong san)) toan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((mot chieu) or (theo chieu)) sang - khach dan va nhung ((cong dan) OR (cong san)) toan cao~".
• Adding a wildcard symbol may retrieve word variants: ((mot chieu) or (theo chieu)) sang - khach dan va nhung ((cong dan) OR (cong san)) toan cao*.