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