Perhaps you should try some spelling variations:
"duong anh quan snippets" » "duong manh quan snippets", "duong xanh quan snippets", "duong vanh quan snippets", "duong anh quang snippets", "duong anh tuan snippets", "duong anh xuan snippets", "duong anh quan slippers"
"dung java java snippets" » "dung va java snippets", "dung 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 anh quan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong anh quan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong anh quan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong anh quan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.