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