Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan van toi snippets" » "doan va toi snippets", "hoang van toi snippets", "luan van toi snippets", "doan van tai snippets", "doan van thi snippets", "doan 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: (((("doan van toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan van toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan van toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan van toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.