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