Perhaps you should try some spelling variations:
"dung deu case snippets" » "dung deu code snippets", "dung de case snippets", "dung du case snippets", "dung dau case snippets", "dung eu case snippets", "dung does case snippets", "dung cjeu case snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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 deu case snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung deu case snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung deu case snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung deu case snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.