Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach moi cac snippets" » "sach doi cac snippets", "sach hoi cac snippets", "bach mai cac snippets", "sach voi cac snippets", "sach mo cac 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 moi cac 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 moi cac snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach moi cac snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach moi cac snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.