Perhaps you should try some spelling variations:
dang nganh » duong nganh, dung ngan, dang hanh
nganh cong » nhanh chong, thanh cong
tranh cong » thanh cong, trinh cong, tran cong
cong thai » cong hai, hong thai, cong thanh
cong khi » khong khi, co khi, cong ha
so dang » su dang, so dan, so dung
su canh » suc canh, su can, su anh

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so dang nganh cong thai đong luc ) or ( su canh tranh cong khi đong luc ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so dang nganh cong thai đong luc ) OR ( su canh tranh cong khi đong luc )).
• Adding a wildcard symbol may retrieve word variants: (( so dang nganh cong thai đong luc ) or ( su canh tranh cong khi đong luc ))*.