Perhaps you should try some spelling variations:
dung phuong » dung thuong, bang phuong, dung chung
phuong danh » phuong anh, phuong dinh, phuong hanh
nhanh tinh » nhanh thanh, hanh trinh, nhan sinh
bien tinh » bi tinh, yen tinh, diep tinh
canh tinh » hanh tinh, manh tinh, canh tranh
cua dung » cua dang, cua dong, qua dung
toan cao » toan ban
toan tap » toan ban
so bien » mot bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so bien tinh - ((canh tinh) or (nhanh tinh)) cua dung phuong danh ((toan cao) OR (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - ((canh tinh) OR (nhanh tinh)) cua dung phuong danh ((toan cao) OR (toan tap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so bien tinh - ((canh tinh) or (nhanh tinh)) cua dung phuong danh ((toan cao) OR (toan tap))".
• Adding a wildcard symbol may retrieve word variants: so bien tinh - ((canh tinh) or (nhanh tinh)) cua dung phuong danh ((toan cao) OR (toan tap))*.