Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
vien thanh » viet thanh, tien thanh, dien thanh
tranh cua » doanh cua, manh cua
bang cong » dang cong, hang cong, dung cong
bang song » nang song
dan toan » van toan, dan than, manh toan
toan ban » van ban

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 nganh) or (vien thanh)) - canh tranh cua ((bang cong) or (bang song)) dan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (vien thanh)) - canh tranh cua ((bang cong) OR (bang song)) dan toan ban.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) or (vien thanh)) - canh tranh cua ((bang cong) or (bang song)) dan toan ban*.