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