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