Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"cao han lon snippets" » "cao nhan lon snippets", "cao phan lon snippets", "cao van lon snippets", "cao han tong snippets", "cao hai long snippets", "cao 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: (((("cao 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: (((("cao han lon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cao han lon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cao han lon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.