Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khen ca son snippets" » "khien cau son snippets", "khan cap son snippets", "when can son snippets", "khen cao son snippets", "khen ha son snippets", "khen ca san 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 son 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 son snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khen ca son snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khen ca son snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.