Perhaps you should try some spelling variations:
"python using java grippers" » "python using data grippers", "python using java slippers"
"nu phan van slippery" » "nu pham van slippery", "nu thanh van slippery", "nu luan van slippery", "nu than van slippery", "su phan van slippery", "uu phan van slippery", "nu phan van slippers"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets", "locating bug code 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: (((("nu phan van slippery") or ("python using java grippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nu phan van slippery") OR ("python using java grippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nu phan van slippery ) or ( python using java grippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nu phan van slippery") or ("python using java grippers"))) or ("locating bug code snippets"))*.