Perhaps you should try some spelling variations:
vien nganh » vien thanh
manh trung » manh tung, thanh trung, manh hung
hieu xanh » chieu xanh, hieu manh, hieu nganh
cua dang » cua ban
cong san » cong tac
san than » sang than, san thanh, ban than
than cau » toan cau, phan cau, than cap

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 xanh) or (vien nganh)) - manh trung ((cua cong) or (cua dang)) cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (vien nganh)) - manh trung ((cua cong) OR (cua dang)) cong san than cau.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) or (vien nganh)) - manh trung ((cua cong) or (cua dang)) cong san than cau*.