Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu ha long snippets" » "ngu hai long snippets", "ngu ha dong snippets", "ngu ca long snippets", "ngu va long snippets", "ngu ta 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 ha 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 ha long snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu ha long snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu ha long snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.