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