Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"sach thi mon snippets" » "sach thu mon snippets", "sach tai mon snippets", "sach thieu mon snippets", "sach thi mo snippets", "sach thi moi snippets", "sach thi cong 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 thi mon 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 thi mon snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( sach thi mon snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("sach thi mon snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.