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