Perhaps you should try some spelling variations:
"python using java slippery" » "python using data slippery"
"van thuc dan slippers" » "va thuc dan slippers", "dan thuc dan slippers", "van thu dan slippers", "van thuc hanh slippers", "van hoc dan slippers", "van thuc vat slippers", "van thuc dan grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

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