Perhaps you should try some spelling variations:
thieu xanh » hieu manh, thien anh, thien danh
chieu xanh » chieu sach, chieu sang, chieu tinh
dang cong » dung cong
anh dang » anh dong, anh dung, anh bang
dang cua » dung cua, dong cua, mang cua
tac toan » tap toan, tam toan, hach 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: toc ((thieu xanh) OR (chieu xanh)) - anh dang cua ((dang cong) or (dung trong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((thieu xanh) OR (chieu xanh)) - anh dang cua ((dang cong) OR (dung trong)) tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((thieu xanh) OR (chieu xanh)) - anh dang cua ((dang cong) or (dung trong)) tac toan cau".
• Adding a wildcard symbol may retrieve word variants: toc ((thieu xanh) OR (chieu xanh)) - anh dang cua ((dang cong) or (dung trong)) tac toan cau*.