Perhaps you should try some spelling variations:
"minh cong code snippets" » "minh cuong code snippets", "sinh cong code snippets", "minh hoang code snippets", "minh cong cong snippets", "minh cong co snippets", "minh cong che snippets", "minh cong code slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("minh cong code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("minh cong code snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("minh cong code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.