Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan duy doc snippets" » "pham duy doc snippets", "phan huy doc snippets", "phan duc doc snippets", "phan day doc snippets", "phan duy dac snippets", "phan duy dot 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 duy doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan duy doc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan duy doc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan duy doc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.