Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"hai van toan snippets" » "hai van code snippets", "hai van tuan snippets", "hai van tan snippets", "hai van thanh snippets", "thai van toan snippets", "ha van toan snippets", "hai tan toan snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data 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: (((("hai van toan snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hai van toan snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hai van toan snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hai van toan snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.