Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cua han lon snippets" » "cua nhan lon snippets", "cua hang lon snippets", "cua phan lon snippets", "cua han tong snippets", "cua hai long snippets", "cua phan lan 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: (((("cua han lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cua han lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cua han lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cua han lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.