Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
lieu tinh » trieu tinh, diep tinh, bien tinh
tranh va » tranh van, trang va, trinh va
cong tac » cong ty
chan cau » phan cau, can cau, chinh cau
ca cau » cua cau, cac cau, can cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (lieu tinh)) - canh tranh va nhung cong tac ((chan cau) or (ca cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (lieu tinh)) - canh tranh va nhung cong tac ((chan cau) OR (ca cau)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (lieu tinh)) - canh tranh va nhung cong tac ((chan cau) or (ca cau))*.