Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thieu sang » chieu sang, thieu khang, hieu lang
van dung » van dong, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
va dung » va duong, vat dung, va ung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu sang) OR (thieu quang)) - canh tranh ((va dung) OR (van dung)) cong dan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu sang) OR (thieu quang)) - canh tranh ((va dung) or (van dung)) cong dan toan cau~".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu sang) OR (thieu quang)) - canh tranh ((va dung) or (van dung)) cong dan toan cau*.