Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach xa dong snippets" » "sach dao dong snippets", "sach nha dong snippets", "sach bai dong snippets", "sach ha dong snippets", "sach van dong snippets", "sach lao dong 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 xa dong 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 xa dong snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach xa dong snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach xa dong snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.