Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pei chen do snippets" » "ben chen do snippets", "hui chen do snippets", "kai chen do snippets", "pei che do snippets", "pei chuyen do snippets", "pei chen den 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: (((("pei chen do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pei chen do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pei chen do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pei chen do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.