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