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