Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, hieu lang, nhieu tang
trinh toan » tinh toan, thanh toan, trinh han
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
toan thuc » toan hoc, dan thuc, nhan thuc
than phan » thanh phan, toan phan, thanh pham

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