Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu ta long snippets" » "ngu ha long snippets", "ngu ca long snippets", "ngu ta rong snippets", "ngu tap long snippets", "ngu tu long 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: (((("ngu ta long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu ta long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu ta long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu ta long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.