Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
chiet tach » chieu sach
hong cuong » hong vuong, thong chuong, phong chong
hung cuong » hung vuong, hung luong, quang cuong
hanh dung » thanh dung, anh dung, hanh dong
dung cua » dung luan, dung cho
bai toan » bai tap
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: theo ((chieu xanh) or (chiet tach)) - hanh dung cua ((hong cuong) OR (hung cuong)) bai toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu xanh) OR (chiet tach)) - hanh dung cua ((hong cuong) OR (hung cuong)) bai toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chieu xanh) or (chiet tach)) - hanh dung cua ((hong cuong) OR (hung cuong)) bai toan cau".
• Adding a wildcard symbol may retrieve word variants: theo ((chieu xanh) or (chiet tach)) - hanh dung cua ((hong cuong) OR (hung cuong)) bai toan cau*.