Perhaps you should try some spelling variations:
"dang ngoc duc snippets" » "hoang ngoc duc snippets", "van ngoc duc snippets", "dang nghe duc snippets", "dang ngo duc snippets", "dang ngoc dung snippets", "dang ngoc de snippets", "dang ngoc duc slippers"
"python using sat snippets" » "python using data snippets", "python using a snippets", "python using raw snippets", "python using sat slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dang ngoc duc snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang ngoc duc snippets") OR ("python using sat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang ngoc duc snippets ) or ( python using sat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang ngoc duc snippets") or ("python using sat snippets"))) or ("locating bug code snippets"))*.