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