Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"van mach cao snippets" » "van manh cao snippets", "ban mach cao snippets", "van hach cao snippets", "van mac ca snippets", "van sach cap snippets", "van mach lac 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: (((("van mach 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: (((("van mach cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( van mach cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("van mach cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.