Perhaps you should try some spelling variations:
phuong thao » phuong thuc
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
hanh tang » hanh trang, anh tang, hanh mang
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban
tang va » trang va, tang van, thang va
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 va dung ((phuong thao) or (phuong phap)) ((toan cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu xanh - hanh tang va dung ((phuong thao) OR (phuong phap)) ((toan cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - hanh tang va dung ((phuong thao) or (phuong phap)) ((toan cau) or (toan tap))*.