Perhaps you should try some spelling variations:
"phi van sung grippers" » "phi van soft grippers", "phi van dung grippers", "phi van hung grippers", "phi van duong grippers", "phi san sung grippers", "thi van sung grippers", "phi va sung grippers"
"python using java slippery" » "python using data slippery", "python using java 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: (((("phi van sung grippers") or ("python using java slippery"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phi van sung grippers") OR ("python using java slippery"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phi van sung grippers ) or ( python using java slippery ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phi van sung grippers") or ("python using java slippery"))) or ("locating bug code snippets"))*.