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