Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach li chat snippets" » "sach lo chat snippets", "sach bai chat snippets", "sach doi chat snippets", "sach ly chat snippets", "sach lai chau snippets", "sach gia chat 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 li chat 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 li chat snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach li chat snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach li chat snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.