Perhaps you should try some spelling variations:
"dong bang code snippets" » "dong san code snippets", "dong bang cong snippets", "dong bang che snippets", "dong bang cot snippets"
"dung ngu java snippets" » "dung nga java snippets", "dung ngo java snippets", "dung nguoi java snippets", "dung ngu va snippets"
"locating bug core snippets" » "locating bug code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung ngu java snippets") or ("dong bang code snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ngu java snippets") OR ("dong bang code snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung ngu java snippets ) or ( dong bang code snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung ngu java snippets") or ("dong bang code snippets"))) or ("locating bug core snippets"))*.