Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach vi cho snippets" » "mach vi cho snippets", "sach va cho snippets", "sach viet cho snippets", "sach ve cho snippets", "sach vu 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: (((("sach vi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sach vi cho snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach vi cho snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach vi cho snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.