Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach nhan co snippets" » "sach nha co snippets", "sach han co snippets", "sach ngan co snippets", "sach nhan con snippets", "sach phan co snippets", "sach nhan mo 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 nhan co 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 nhan co snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach nhan co snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach nhan co snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.