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