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