Perhaps you should try some spelling variations:
chieu sang » chieu xanh, hieu lang, nhieu tang
chieu sach » chinh sach, chiet tach, chieu xanh
toan thuc » toan hoc, dan thuc, nhan thuc
thuc hung » thuc chung, thuc nhung, thuc dung
hung cong » nhung cong, hung cuong, phung cong
than phan » thanh phan, thanh pham, thanh nhan
toan phan » thanh phan, toan ban, hoa phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sang) or (chieu sach)) - tinh toan thuc hung cong ((than phan) OR (toan phan)) cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (chieu sach)) - tinh toan thuc hung cong ((than phan) OR (toan phan)) cac*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (chieu sach)) - tinh toan thuc hung cong ((than phan) OR (toan phan)) cac*".