Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khan van den snippets" » "khanh van den snippets", "phan van den snippets", "nhan van den snippets", "khan van de snippets", "khan van der snippets", "khan ban 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: (((("khan van 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: (((("khan van den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khan van den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khan van den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.