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
hang cua » mang cua, hang ca, huong cua
toan cau » toan ban, toan tap, toan tai
toan cao » toan ban, toan tap

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