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