Perhaps you should try some spelling variations:
"vu bach doanh co khi đong luc" » "vu sach danh co khi đong luc", "vu cac doanh co khi đong luc", "vu bach dan co khi đong luc", "vu bach doanh cua khi đong luc", "vu bach doanh va khi đong luc", "vu bach anh co khi đong luc"
"su canh tranh cong khi đong luc" » "su canh thanh cong khi đong luc", "su canh trinh cong khi đong luc", "su canh tran cong khi đong luc", "su canh tranh cong thai đong luc", "su canh tranh khong khi đong luc", "su canh tranh cong ha đong luc", "suc canh tranh cong khi đong luc", "su can tranh cong khi đong luc", "su anh tranh cong khi đong luc"

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: (("vu bach doanh co khi đong luc") OR ("su canh tranh cong khi đong luc"))~.
• Removing quotes may allow a broader search: (( vu bach doanh co khi đong luc ) or ( su canh tranh cong khi đong luc ))~.
• Adding a wildcard symbol may retrieve word variants: (("vu bach doanh co khi đong luc") or ("su canh tranh cong khi đong luc"))*.