Perhaps you should try some spelling variations:
"dung huong code snippets" » "dung thuong code snippets", "dung phuong code snippets", "dong huong code snippets", "dung huong co snippets", "dung huong com snippets", "dung huong code slippers"
"tinh dung code snippets" » "trinh dung code snippets", "tin dung code snippets", "tinh quang code snippets", "tinh dung cong snippets", "tinh dung co snippets", "tinh dung de snippets", "tinh 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: (((("tinh dung code snippets") or ("dung huong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tinh dung code snippets") OR ("dung huong code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tinh dung code snippets ) or ( dung huong code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tinh dung code snippets") or ("dung huong code snippets"))) or ("locating bug code snippets"))*.