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