Perhaps you should try some spelling variations:
"dung dang cong nghe" » "dung cong cong nghe" (Expand Search), "duong dang cong nghe" (Expand Search), "dvung dang cong nghe" (Expand Search), "dung dung cong nghe" (Expand Search)
"ung dang cong nghe" » "uong dang cong nghe" (Expand Search), "vung dang cong nghe" (Expand Search), "ung dung cong nghe" (Expand Search)
"vung dan cong nghe" » "vung dat cong nghe" (Expand Search), "vung van cong nghe" (Expand Search), "huong dan cong nghe" (Expand Search), "vung doan cong nghe" (Expand Search), "vung dan ong nghe" (Expand Search), "vung san cong nghe" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("ung dang cong nghe") OR ((("dung dang cong nghe") OR ("vung dan cong nghe"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ung dang cong nghe\") OR (((\"dung dang cong nghe\") OR (\"vung dan cong nghe\"))))".
• Removing quotes may allow a broader search: (( ung dang cong nghe ) OR ((( dung dang cong nghe ) OR ( vung dan cong nghe )))).
• Adding a wildcard symbol may retrieve word variants: (("ung dang cong nghe") OR ((("dung dang cong nghe") OR ("vung dan cong nghe"))))*.