Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach mo chon snippets" » "sach moi chon snippets", "sach lo chon snippets", "sach dao chon snippets", "sach mo cho snippets", "sach mo phong 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 mo chon 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 mo chon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach mo chon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach mo chon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.