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