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