Perhaps you should try some spelling variations:
"duong ham nhan snippets" » "duong cham nhan snippets", "duong lam nhan snippets", "duong tam nhan snippets", "duong pham nhan snippets", "duong hat nhan snippets", "duong cam nhan snippets", "duong ham nhan slippers"
"hang java java snippets" » "hang va java snippets", "hang java java 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: (((("duong ham nhan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong ham nhan snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong ham nhan snippets ) or ( hang java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong ham nhan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))*.