Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
manh toan » thanh toan, anh tuan, tinh toan
theo toc » ho toc, thac toc, theo bo
toc sach » hoc sach, doc sach, thuoc sach
manh cua » doanh cua, ban cua
dan toan » van toan, dan than, xuan toan

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 manh cua ((nhung cong) OR (dung cong)) ((dan toan) or (manh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo toc sach - canh manh cua ((nhung cong) OR (dung cong)) ((dan toan) OR (manh toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo toc sach - canh manh cua ((nhung cong) OR (dung cong)) ((dan toan) or (manh toan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo toc sach - canh manh cua ((nhung cong) OR (dung cong)) ((dan toan) or (manh toan)) tap*.