Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luan han lon snippets" » "luan hoan lon snippets", "luan phan lon snippets", "luan van lon snippets", "luan han tong snippets", "luan hai long snippets", "luan phan lan 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 han lon 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 han lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan han lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan han lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.