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