Perhaps you should try some spelling variations:
"python using java slippery" » "python using data slippery", "python using java slippers"
"van den code snippets" » "van den coi snippets", "van den cong snippets", "van de code snippets", "van der code snippets", "ban den code snippets", "van den code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("van den code snippets") or ("python using java slippery"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van den code snippets") OR ("python using java slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van den code snippets ) or ( python using java slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van den code snippets") or ("python using java slippery"))) or ("locating bug code snippets"))*.