Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hien tinh » khien tinh, thien tinh, bien tinh
canh manh » lanh manh, canh tranh, cach mang
hang nong » thang long, han tong
manh cua » doanh cua, ban cua
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien tinh - canh manh cua ((nhung cong) or (hang nong)) dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - canh manh cua ((nhung cong) OR (hang nong)) dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - canh manh cua ((nhung cong) or (hang nong)) dan chan cau*.