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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"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 ))~.
• Adding a wildcard symbol may retrieve word variants: (((("va dung quang slippery") OR ("python using a snippets"))) OR ("locating bug code snippets"))*.