Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hoc sach con snippets" » "hoc sinh con snippets", "hoc cac con snippets", "hoc anh con snippets", "hoc cach con snippets", "hoc sach song snippets", "hoc sach ngon 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: (((("hoc sach con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hoc sach con snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hoc sach con snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hoc sach con snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.