Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach xa cua snippets" » "sach dao cua snippets", "sach nha cua snippets", "sach bai cua snippets", "sach xua cua snippets", "sach ca cua snippets", "sach ma 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 xa 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 xa cua snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach xa cua snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach xa cua snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.