Perhaps you should try some spelling variations:
"python using java slippers" » "python using data slippers", "python using java slippery", "python using java grippers"
"van tu duoc snippets" » "van te duoc snippets", "van ty duoc snippets", "van ta duoc snippets", "van thu duoc snippets", "van du duoc snippets", "ban tu duoc snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van tu duoc snippets") OR ("python using java slippers"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( van tu duoc snippets ) or ( python using java slippers ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van tu duoc snippets") or ("python using java slippers"))) or ("locating bug code snippets"))*.