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