Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngu vien cac snippets" » "ngu viet cac snippets", "ngu dien cac snippets", "ngu tieng cac snippets", "ngu vien bach snippets", "ngu vien dai snippets", "ngu vien da 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 vien cac 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 vien cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngu vien cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngu vien cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.