Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"dau van toan snippets" » "dau van tuan snippets", "dau van tan snippets", "dau van thanh snippets", "dao van toan snippets", "dam van toan snippets", "dau va 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: (((("dau 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: (((("dau van toan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dau van toan snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dau van toan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.