Perhaps you should try some spelling variations:
"thuoc sach code snippets" » "hoc sach code snippets", "nuoc sach code snippets", "thuat sach code snippets", "thuoc sach che snippets", "thuoc sach de snippets", "thuoc sach code slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("python using a snippets") or ("thuoc sach code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using a snippets") OR ("thuoc sach code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( python using a snippets ) or ( thuoc sach code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using a snippets") or ("thuoc sach code snippets"))) or ("locating bug code snippets"))*.