Perhaps you should try some spelling variations:
quang trung » truong trung
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
quang dung » ung dung, cuong dung
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham toan
toan cau » 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: doc ((chieu xanh) OR (chieu sach)) - canh tranh ((quang dung) or (quang trung)) cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((chieu xanh) OR (chieu sach)) - canh tranh ((quang dung) OR (quang trung)) cong tam toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((chieu xanh) OR (chieu sach)) - canh tranh ((quang dung) or (quang trung)) cong tam toan cau".
• Adding a wildcard symbol may retrieve word variants: doc ((chieu xanh) OR (chieu sach)) - canh tranh ((quang dung) or (quang trung)) cong tam toan cau*.