Perhaps you should try some spelling variations:
"phan quoc co snippets" » "han quoc co snippets", "tran quoc co snippets", "toan quoc co snippets", "phan quoc cao snippets", "phan quoc cho snippets", "phan duoc co 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: (((("phan quoc co snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan quoc co snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan quoc co snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan quoc co snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.