Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug code slippers" » "locating bug code snippets", "locating bung code slippers", "locating bugs code slippers"
"oi duc dan snippets" » "oi duoc dan snippets", "oi duc tan snippets", "oi duc dai snippets", "hoai duc dan 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: (((("oi duc dan snippets") or ("python missing data snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("oi duc dan snippets") OR ("python missing data snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( oi duc dan snippets ) or ( python missing data snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("oi duc dan snippets") or ("python missing data snippets"))) or ("locating bug code slippers"))*.