Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
luan phuong » lan phuong, quang phuong, doan phuong
hanh tang » hanh trang, anh tang, hanh mang
hach toan » thanh toan, manh toan
chao chu » cho chu, cua chu, cao cho
chu xanh » chu manh, chieu xanh, chua xang
tac toan » tap toan, tam toan, tich toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: chao chu xanh - ((hanh tang) or (canh tranh)) luan phuong cong ((tac toan) OR (hach toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: chao chu xanh - ((hanh tang) OR (canh tranh)) luan phuong cong ((tac toan) OR (hach toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "chao chu xanh - ((hanh tang) or (canh tranh)) luan phuong cong ((tac toan) OR (hach toan)) cao".
• Adding a wildcard symbol may retrieve word variants: chao chu xanh - ((hanh tang) or (canh tranh)) luan phuong cong ((tac toan) OR (hach toan)) cao*.