Perhaps you should try some spelling variations:
"pham van dat snippets" » "pham van dao snippets", "pham van dau snippets", "pham dan dat snippets", "phan van dat snippets", "pham van dat 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: (((("pham van dat snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham van dat snippets") OR ("python using a snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( pham van dat snippets ) or ( python using a snippets ))) or ( locating bug code snippets ))*.