Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
anh tang » anh bang, anh dang, anh nang
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan
tang va » trang va, tang van, thang va

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 sach)) - anh tang va nhung cong ((tac toan) OR (tap toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chieu sach)) - anh tang va nhung cong ((tac toan) OR (tap toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chieu sach)) - anh tang va nhung cong ((tac toan) OR (tap toan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chieu sach)) - anh tang va nhung cong ((tac toan) OR (tap toan)) tap*.