Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
pham toan » pham tuan, pham tan, phap toan
ho chieu » theo chieu, hoc thieu, doi chieu
tam than » ban than
va dung » van dung, va duong, vat dung

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 - hanh hang va dung cong ((pham toan) or (tam than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - hanh hang va dung cong ((pham toan) OR (tam than)) cau.
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - hanh hang va dung cong ((pham toan) or (tam than)) cau*.