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