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