Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong dan de snippets" » "cong san de snippets", "cong tan de snippets", "huong dan de snippets", "cong dan den snippets", "cong dang de snippets", "cong van de 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: (((("cong dan de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong dan de snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong dan de snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong dan de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.