Perhaps you should try some spelling variations:
hieu nganh » hiem ngan, hieu manh, nghiep nganh
vien nganh » vien 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 cau » toan cao, toan ban, toan tap

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 nganh)) - canh tranh cua ((bang cong) or (bang song)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (vien nganh)) - canh tranh cua ((bang cong) OR (bang song)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) OR (vien nganh)) - canh tranh cua ((bang cong) or (bang song)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) OR (vien nganh)) - canh tranh cua ((bang cong) or (bang song)) dan toan cau*.