Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngoc van do snippets" » "ngo van do snippets", "ngoc lan do snippets", "ngoc tan do snippets", "ngoc van dao snippets", "ngoc van de snippets", "ngoc 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: (((("ngoc 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: (((("ngoc van do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngoc van do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngoc van do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.