Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dan vien da snippets" » "dan vien code snippets", "dan viet da snippets", "nhan vien da snippets", "danh viet da snippets", "dan vien dai snippets", "dan hien dai snippets"
"python using data snippets" » "python using java snippets", "python using sat snippets", "python missing data 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: (((("dan vien da snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan vien da snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dan vien da snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan vien da snippets") or ("python using data snippets"))) or ("locating bug core snippets"))*.