Perhaps you should try some spelling variations:
bien tinh » bi tinh, yen tinh, diep tinh
tranh cua » doanh cua, manh cua
bang cong » bang song, hang cong, cong cong
dung cong » dung trong
hoc bien » hoc hien, hoc vien, hoa bien
dan chan » dan gian, dan ca, van chat
chan ban » can ban, chat ban, chan nan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc bien tinh - canh tranh cua ((((bang cong) or (dung cong))) or (dang cong)) dan chan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc bien tinh - canh tranh cua ((((bang cong) OR (dung cong))) OR (dang cong)) dan chan ban.
• Adding a wildcard symbol may retrieve word variants: hoc bien tinh - canh tranh cua ((((bang cong) or (dung cong))) or (dang cong)) dan chan ban*.