Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung dan hang slippers" » "dung dat hang slippers", "dung san hang slippers", "tung dan hang slippers", "dung ban hang slippers", "dung van hang slippers", "dung dan hang slippery", "dung dan hang grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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: (((("dung dan hang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dan hang slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung dan hang slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung dan hang slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.