Perhaps you should try some spelling variations:
"phong gian don snippets" » "khong gian don snippets", "phong giao don snippets", "chong gian don snippets", "phong gian dan snippets", "phong giang son snippets", "phong gian dien snippets"
"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: (((("phong gian don snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phong gian don snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phong gian don snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phong gian don snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.