Perhaps you should try some spelling variations:
"nhat cao code snippets" » "nha cao code snippets", "chat cao code snippets", "nhat cho code snippets", "nhat cao cong snippets", "nhat cao de snippets", "nhat cfd code snippets", "nhat cao code 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"

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: (((("nhat cao code snippets") or ("python using a snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhat cao code snippets") OR ("python using a snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhat cao code snippets ) or ( python using a snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhat cao code snippets") or ("python using a snippets"))) or ("locating bug code snippets"))*.