Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo chieu » theo tieu, ho chieu, theo chu
chieu han » chieu sang, chieu xanh, phieu phan
thanh ban » thanh san, thanh van, thanh bac
cua nhung » va nhung
dan toan » van toan, manh toan, dien toan
dan than » dan chan, ban than, van than
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu han - thanh ban cua nhung cong ((((dan toan) OR (xuan toan))) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu han - thanh ban cua nhung cong ((((dan toan) OR (xuan toan))) OR (dan than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu han - thanh ban cua nhung cong ((((dan toan) OR (xuan toan))) or (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: theo chieu han - thanh ban cua nhung cong ((((dan toan) OR (xuan toan))) or (dan than)) cau*.