Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu tinh, hieu manh
chieu sang » chieu sach, hieu lang, nhieu tang
nhanh lang » nhanh thang, nhan dang, nhanh dong
dung cong » dung trong
qua dung » quang dung, su dung, qua song
cong ban » cong bang, cong san, cong tan
ban toan » bai toan, ban than, van 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: theo ((chieu xanh) OR (chieu sang)) - ((nhanh lang) or (nhanh quang)) qua dung cong ban toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sang)) - ((nhanh lang) OR (nhanh quang)) qua dung cong ban toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) OR (chieu sang)) - ((nhanh lang) or (nhanh quang)) qua dung cong ban toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) OR (chieu sang)) - ((nhanh lang) or (nhanh quang)) qua dung cong ban toan cau*.