Perhaps you should try some spelling variations:
"danh van code snippets" » "doanh van code snippets", "dang van code snippets", "dinh van code snippets", "danh van de snippets", "danh van hoe snippets", "danh van cong snippets", "danh van code 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"

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: "((((\"danh van code snippets\") OR (\"python using a snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( danh van code snippets ) OR ( python using a snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("danh van code snippets") OR ("python using a snippets"))) OR ("locating bug code snippets"))*.