Perhaps you should try some spelling variations:
"dung sinh data slippers" » "duong sinh data slippers", "dang sinh data slippers", "dung ninh data slippers", "dung using data slippers", "dung sinh vat slippers", "dung dinh dat slippers", "dung sinh data slippery", "dung sinh data grippers"
"dung java java snippets" » "dung va java snippets"
"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 sinh data 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 sinh data slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung sinh data slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung sinh data slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.