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