Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung luan dan slippers" » "dung luan danh slippers", "dung luan van slippers", "dung luat dan slippers", "dung luan dan slippery", "dung luan dan 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 luan dan 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 luan dan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung luan dan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung luan dan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.