Perhaps you should try some spelling variations:
"python using data slippery" » "python using java slippery", "python using sat slippery", "python missing data slippery", "python using data slippers"
"le dan zhang grippers" » "le yan zhang grippers", "le lidan zhang grippers", "le danh thang grippers", "ke dan zhang grippers", "le dan zhang slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets", "locating bug code slippers"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("le dan zhang grippers") or ("python using data slippery"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("le dan zhang grippers") OR ("python using data slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( le dan zhang grippers ) or ( python using data slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("le dan zhang grippers") or ("python using data slippery"))) or ("locating bug code snippets"))*.