Perhaps you should try some spelling variations:
"trinh nghe cao snippets" » "trinh nghien cao snippets", "trinh he cao snippets", "trinh nha cao snippets", "trinh nghe co snippets", "trinh nghe nano snippets", "trinh nghe chan snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung java java snippets\") OR (\"trinh nghe cao snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( trinh nghe cao snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("trinh nghe cao snippets"))) OR ("locating bug code snippets"))*.