Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan den hoa snippets" » "quan den hoa snippets", "luan de hoa snippets", "luan len hoa snippets", "luan dien hoa snippets", "luan den ha snippets", "luan den ho 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: (((("luan den hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luan den hoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan den hoa snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan den hoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.