Perhaps you should try some spelling variations:
dang doanh » dung doanh, dong doanh, hang doanh
tranh cua » manh cua
tong cong » trong cong, cong cong, dung cong
cong dang » cong dong, cong dan, cong dung
doanh cua » doanh luan
doc hieu » hoc thieu, hoc hien
cua tong » cua cong, cua dong, cua nong

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (toc thieu)) manh - canh tranh cua tong cong dang doanh cua~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) manh - canh tranh cua tong cong dang doanh cua*.