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
tang luan » dung luan
tang cua » mang cua, hang cua, thong cua
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 ((tang cua) OR (tang luan)) nhung cong ((dan than) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo hieu lang - hanh ((tang cua) OR (tang luan)) nhung cong ((dan than) OR (van than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo hieu lang - hanh ((tang cua) OR (tang luan)) nhung cong ((dan than) or (van than)) cau".
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - hanh ((tang cua) OR (tang luan)) nhung cong ((dan than) or (van than)) cau*.