Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
luan nhung » luan chung, luan hung, quan nhung
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, dieu hanh
hanh dung » thanh dung, anh dung, hanh dong
ban thanh » ban hanh, ban hang
van than » van thanh, van thang, van tuan

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 (hieu nganh)) - hanh dung luan nhung cong ((van than) or (ban thanh)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - hanh dung luan nhung cong ((van than) OR (ban thanh)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - hanh dung luan nhung cong ((van than) or (ban thanh)) cau".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - hanh dung luan nhung cong ((van than) or (ban thanh)) cau*.