Perhaps you should try some spelling variations:
bien tinh » bi tinh, yen tinh, diep tinh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
xuong dan » huong dan, xuong san, tuong dan
tung dan » dung dan, huong dan, trung dai
toan cao » toan ban, toan tap
co bien » co dien, so bien, bo bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: co bien tinh - canh tranh cua nhung ((xuong dan) or (tung dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co bien tinh - canh tranh cua nhung ((xuong dan) OR (tung dan)) toan cao.
• Adding a wildcard symbol may retrieve word variants: co bien tinh - canh tranh cua nhung ((xuong dan) or (tung dan)) toan cao*.