Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
chieu sang » chieu sach, chieu xanh, hieu lang
phuong dan » phuong danh, phuong doan, huong dan
doi chieu » doc hieu, doi chi, ho chieu
tranh su » trinh su, trang su, tranh cua
than cau » toan cau, phan cau, than cap
phan dau » phan tu, hang dau

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 sang - canh tranh su dung phuong dan ((than cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - canh tranh su dung phuong dan ((than cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - canh tranh su dung phuong dan ((than cau) or (phan dau))*.