Perhaps you should try some spelling variations:
"tri dan dung snippets" » "tri van dung snippets", "tri tin dung snippets", "tri ap dung snippets", "tri ban dung snippets", "thi dan dung snippets", "tri dan dung 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: (((("python using a snippets") OR ("tri dan dung snippets"))) OR ("locating bug code snippets"))~.
• Removing quotes may allow a broader search: (((( python using a snippets ) or ( tri dan dung snippets ))) or ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("python using a snippets") or ("tri dan dung snippets"))) or ("locating bug code snippets"))*.