Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"tran duc phan slippers" » "tran dung phan slippers", "tran duc thang slippers", "tran duc phung slippers", "tran duc phan slippery", "tran duc phan 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: (((("tran duc phan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran duc phan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran duc phan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran duc phan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.