Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tuong dan » huong dan, xuong dan, truong dai
tung dan » dung dan, huong dan, trung dai
toan cao » toan ban, toan tap
co lieu » cot lieu, co hieu, so lieu

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

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