Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
theo toc » ho toc, thac toc, theo bo
toc sach » hoc sach, doc sach, thuoc sach
van toan » van tuan, van tan, van thanh
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: theo toc sach - canh tranh cua ((nhung cong) OR (dung cong)) van toan ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo toc sach - canh tranh cua ((nhung cong) OR (dung cong)) van toan ban".
• Adding a wildcard symbol may retrieve word variants: theo toc sach - canh tranh cua ((nhung cong) OR (dung cong)) van toan ban*.