Perhaps you should try some spelling variations:
"nam van tra snippets" » "nam dan tra snippets", "nam va tra snippets", "pham van tra snippets", "nam van tri snippets", "nam van tru snippets", "nam van tra 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: "((((\"nam van tra snippets\") OR (\"python using a snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( nam van tra snippets ) OR ( python using a snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("nam van tra snippets") OR ("python using a snippets"))) OR ("locating bug code snippets"))*.