Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach tu choi snippets" » "sach thu choi snippets", "cach tu choi snippets", "sach ty choi snippets", "sach su choi snippets", "sach tu chi snippets", "sach tu chon 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 tu choi 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 tu choi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach tu choi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach tu choi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.