Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"duc dung he snippets" » "duc dung code snippets", "duc hung he snippets", "duc cuong he snippets", "duc phung he snippets", "duc dung cho 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: (((("python using data snippets") or ("duc dung he snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("python using data snippets") OR ("duc dung he snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( python using data snippets ) or ( duc dung he snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("python using data snippets") or ("duc dung he snippets"))) or ("locating bug core snippets"))*.