Perhaps you should try some spelling variations:
hang cong » dang cong, hang nong, bang cong
cong dang » cong dong, cong dan, cong dung
theo rau » theo dau, theo mau, theo chu
rau sach » cau sach, hau sach, khau sach
tranh va » tranh van, trang va, trinh va
tran cao » tran chau, trang cho, tranh cac
toan cao » toan ban, toan tap
va hang » van hang, va nang, va lang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo rau sach - canh tranh va hang cong dang ((tran cao) or (toan cao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo rau sach - canh tranh va hang cong dang ((tran cao) OR (toan cao)).
• Adding a wildcard symbol may retrieve word variants: theo rau sach - canh tranh va hang cong dang ((tran cao) or (toan cao))*.