Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lenh van toi snippets" » "menh van toi snippets", "lenh va toi snippets", "lenh canh toi snippets", "lenh van tai snippets", "lenh van thi snippets", "lenh 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: (((("lenh 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: (((("lenh van toi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lenh van toi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lenh van toi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.