Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong van chat snippets" » "duong van chat snippets", "dang van chat snippets", "dong von chat snippets", "dong cao chat 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 (\"dong van chat snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( dong van chat snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("dong van chat snippets"))) OR ("locating bug code snippets"))*.