Perhaps you should try some spelling variations:
"python using java slippery" » "python using data slippery"
"li yan zhang slippers" » "li yang zhang slippers", "li ban hang slippers", "li van khang slippers", "li yan zhang grippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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