Perhaps you should try some spelling variations:
phuong doan » phuong loan, phuong hoang, huong dan
dung phuong » dung thuong, bang phuong, dung chung
chieu sang » chieu sach, chieu xanh, hieu lang
doi chieu » doc hieu, doi chi, ho chieu
dong cua » dung cua, huong cua, thong cua
cong cua » cong cu, huong cua, thong cua
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sang - nhanh ((dong cua) OR (cong cua)) dung phuong doan ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sang - nhanh ((dong cua) OR (cong cua)) dung phuong doan ((toan cau) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sang - nhanh ((dong cua) OR (cong cua)) dung phuong doan ((toan cau) or (toan ban))*.