Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khen ca den snippets" » "khien cau den snippets", "khan cap den snippets", "when can den snippets", "khen cap den snippets", "khen cau den snippets", "khen ca dan 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: (((("khen ca den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khen ca den snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khen ca den snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khen ca den snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.