Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"luc dong cao snippets" » "luu dong cao snippets", "duc dong cao snippets", "luc cong cao snippets", "luc duong cao snippets", "luc dong co snippets", "luc dong cho 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: (((("luc dong cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luc dong cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luc dong cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luc dong cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.