Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach via cua snippets" » "sach va cua snippets", "sach giao cua snippets", "sach viet cua snippets", "sach gia cua snippets", "sach gian cua snippets", "sach giau cua 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 via cua 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 via cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach via cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach via cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.