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