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