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
cong chat » cong nhat, cong ha, cong suat
tang cua » mang cua, hang cua, thong cua
cong cua » cong cu, dong cua, huong cua

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