Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
hanh trang » thanh trung, canh tranh, hanh trinh
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » anh tang, hanh mang, hanh tung
phap toan » phap hoan, phap luan, phap phan
toan cau » toan cao, toan ban, toan tap
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: doi chieu xanh - ((hanh tang) or (hanh trang)) va dung phuong phap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - ((hanh tang) OR (hanh trang)) va dung phuong phap toan cau.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - ((hanh tang) or (hanh trang)) va dung phuong phap toan cau*.