Perhaps you should try some spelling variations:
"va dung quang slippery" » "va dang quang slippery", "va luong quang slippery", "va dung luan slippery", "van dung quang slippery", "va duong quang slippery", "vat dung quang slippery", "va dung quang 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("va dung quang slippery") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("va dung quang slippery") OR ("python using a snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( va dung quang slippery ) or ( python using a snippets ))) or ( locating bug code snippets ))*.