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