Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cong van cong snippets" » "cong vang cong snippets", "cong san cong snippets", "song van cong snippets", "cong van dong snippets", "cong van phong snippets", "cong phan cong 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 van cong 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 van cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong van cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong van cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.