Perhaps you should try some spelling variations:
"dung va nghe snippets" » "dung va code snippets", "dung van nghe snippets", "dung ve nghe snippets", "dung va nghi snippets"
"locating bug core snippets" » "locating bug code 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: (((("dung va nghe snippets") or ("python using data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung va nghe snippets") OR ("python using data snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung va nghe snippets ) or ( python using data snippets ))) or ( locating bug core snippets )).
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