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