Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu sang » chieu sach, chieu xanh, hieu lang
hanh tranh » canh tranh, hanh trinh, hanh trang
thu phuong » thi phuong, thu huong, theo phuong
tranh thu » tran thu, thanh thu, thanh thuy
ho chieu » theo chieu, hoc thieu, doi chieu
tan toan » tap toan, van toan, dan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu sang - hanh tranh thu phuong cong ((tan toan) OR (tan tran)) cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sang - hanh tranh thu phuong cong ((tan toan) OR (tan tran)) cao".
• Adding a wildcard symbol may retrieve word variants: ho chieu sang - hanh tranh thu phuong cong ((tan toan) OR (tan tran)) cao*.