Perhaps you should try some spelling variations:
"python using code snippets" » "python using cfd snippets", "python using one snippets"
"phan van dat snippets" » "pham van dat snippets", "thanh van dat snippets", "luan van dat snippets", "phan van dao snippets", "phan van dau snippets", "phan dan dat snippets"
"locating bug core snippets" » "locating bug code snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("phan van dat snippets") or ("python using code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan van dat snippets") OR ("python using code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( phan van dat snippets ) or ( python using code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan van dat snippets") or ("python using code snippets"))) or ("locating bug core snippets"))*.