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