Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
toan thuc » toan hoc, dan thuc, nhan thuc
thuc cung » thuc chung, thuc dung, thuc vung
cong than » cong thanh, cong thang, cong thai
cong tan » cong tac, cong san, cong thanh
phan cac » nhan cach, phan dau, phan lap

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 xanh) or (chieu sach)) - tinh toan thuc cung ((cong than) OR (cong tan)) phan cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (chieu sach)) - tinh toan thuc cung ((cong than) OR (cong tan)) phan cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (chieu sach)) - tinh toan thuc cung ((cong than) OR (cong tan)) phan cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (chieu sach)) - tinh toan thuc cung ((cong than) OR (cong tan)) phan cac*.