Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach phac do snippets" » "sach phat do snippets", "sach phap do snippets", "sach nha do snippets", "sach khac do snippets", "sach pham do snippets", "sach phan do 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 phac do 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 phac do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach phac do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach phac do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.