Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hiem ngan » kim ngan, viem gan
tranh cua » doanh cua, manh cua
dung cong » dung trong
cong dung » cuong dung, cong dong, cong luong
cua dung » cua dang, cua dong, qua dung
dung dan » dung dat, dung san, tung dan

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 (hiem ngan)) - canh tranh cua dung cong dung dan ca~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (hiem ngan)) - canh tranh cua dung cong dung dan ca*.