Perhaps you should try some spelling variations:
"co doc thieu snippets" » "co toc thieu snippets", "co doc hieu snippets", "co hoc thieu snippets", "co duoc thieu snippets", "co dot thieu snippets", "co doc thieu slippers"
"python using a snippets" » "python using a slippers"
"locating bug code snippets" » "locating bug code slippers", "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: (((("co doc thieu snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("co doc thieu snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( co doc thieu snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("co doc thieu snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.