Perhaps you should try some spelling variations:
"dung cach nhanh snippets" » "dung cac nganh snippets", "dung cac nhan snippets", "dung cac thanh snippets", "dung cac nhanh snippets", "dung sach nhanh snippets", "dong cach nhanh snippets", "dung cach nhanh slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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: (((("dung dung code snippets") or ("dung cach nhanh snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung dung code snippets") or ("dung cach nhanh snippets"))) or ("locating bug code snippets"))*.