Perhaps you should try some spelling variations:
lieu tinh » trieu tinh, diep tinh, bien tinh
canh manh » lanh manh, canh tranh, cach mang
hang nong » thang long
manh cua » doanh cua, ban cua
van toan » van tuan, van tan, van thanh
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 manh cua ((hang nong) or (han tong)) van toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co lieu tinh - canh manh cua ((hang nong) OR (han tong)) van toan cao.
• Adding a wildcard symbol may retrieve word variants: co lieu tinh - canh manh cua ((hang nong) or (han tong)) van toan cao*.