Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"den dung hoc snippets" » "dan dung hoc snippets", "den vung hoc snippets", "den dong hoc snippets", "den dung thuoc snippets", "den trung hoc 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: (((("den dung hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("den dung hoc snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( den dung hoc snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("den dung hoc snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.