Perhaps you should try some spelling variations:
"python using java grippers" » "python using data grippers", "python using java slippers"
"doi ca viet slippery" » "doi va viet slippery", "doi co viet slippery", "doi hoa viet slippery", "doi cua viet slippery", "doi cay viet slippery", "duoi ca viet slippery", "doi ca viet slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets", "locating bug code slippers"

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

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