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