Perhaps you should try some spelling variations:
phuong cang » phuong bang, phuong hoang, phuong giang
hieu quang » thieu quang, hieu quan, hieu qua
cua phuong » cuu phuong, cuc phuong, luan phuong
hanh dung » thanh dung, anh dung, hanh dong
cang tinh » cong tinh, dang tinh, bang tinh
doc hieu » toc thieu, hoc thieu, hoc hien
dung cua » dung luan, dung cho
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.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu quang - hanh dung cua phuong cang tinh ((toan cau) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu quang - hanh dung cua phuong cang tinh ((toan cau) OR (toan ban))".
• Adding a wildcard symbol may retrieve word variants: doc hieu quang - hanh dung cua phuong cang tinh ((toan cau) OR (toan ban))*.