Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"co cua hon snippets" » "co cua code snippets", "co cua hoi snippets", "co cua hoc snippets", "co ca hon snippets", "con cua hon snippets", "ca cua hon snippets", "cong cua hon 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: (((("co cua hon snippets") or ("python missing data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co cua hon snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( co cua hon snippets ) or ( python missing data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co cua hon snippets") or ("python missing data snippets"))) or ("locating bug core snippets"))*.