Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
hanh dung » thanh dung, anh dung, hanh dong
cua nhung » va nhung
dung cua » dung luan, dung cho
nam toan » nam tan, nam thanh, nam thang
tam toan » tap toan, tam than, pham 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 hieu lang - hanh dung cua nhung cong ((nam toan) OR (tam toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh dung cua nhung cong ((nam toan) OR (tam toan)) cau".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh dung cua nhung cong ((nam toan) OR (tam toan)) cau*.