Perhaps you should try some spelling variations:
"python using java slippery" » "python using data slippery", "python using java slippers"
"cau hoc dan grippers" » "cau hoi dan grippers", "cau hoa dan grippers", "cao hoc dan grippers", "cau hoc dan slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets", "locating bug code slippers"

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