Perhaps you should try some spelling variations:
"vat dung luan slippery" » "van dung luan slippery", "va dung luan slippery", "viet dung luan slippery", "vat dung quan slippery", "vat dung lan slippery", "vat dung luan slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("vat dung luan slippery") OR ("python using a snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( vat dung luan slippery ) or ( python using a snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vat dung luan slippery") or ("python using a snippets"))) or ("locating bug code snippets"))*.