Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach cho cu snippets" » "sach che cu snippets", "danh cho cu snippets", "sach dao cu snippets", "sach cho chu snippets", "sach cho ca snippets", "sach cho tu 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 cho cu 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 cho cu snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach cho cu snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach cho cu snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.