Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"qua sach cap snippets" » "quan sach cap snippets", "quoc sach cap snippets", "qua cac cap snippets", "qua sach dao snippets", "qua sach bai snippets", "qua sach xa 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: (((("qua sach cap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("qua sach cap snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( qua sach cap snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("qua sach cap snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.