Perhaps you should try some spelling variations:
chieu xanh » chieu sang, chieu tinh, hieu manh
chieu sach » chinh sach, chiet tach, chieu sang
hanh tang » hanh trang, anh tang, hanh mang
dung cong » dung trong
pham toan » pham tuan, phap toan, pham tran
tang cua » mang cua, hang cua, tang luan
cua dung » cua dang, cua dong, qua dung
pham tan » pham tuan, pham van, pham tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu xanh) or (chieu sach)) - hanh tang cua dung cong ((pham toan) OR (pham tan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu xanh) OR (chieu sach)) - hanh tang cua dung cong ((pham toan) OR (pham tan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu xanh) or (chieu sach)) - hanh tang cua dung cong ((pham toan) OR (pham tan)) cao".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu xanh) or (chieu sach)) - hanh tang cua dung cong ((pham toan) OR (pham tan)) cao*.