Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"ngan sach le snippets" » "ngan cach le snippets", "ngan sach de snippets", "ngan sach lo snippets", "nganh sach le snippets", "nhan sach le 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: (((("ngan sach le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngan sach le snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( ngan sach le snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("ngan sach le snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.