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