Perhaps you should try some spelling variations:
"dung quang lan snippets" » "dang quang lan snippets", "luong quang lan snippets", "dung luan lan snippets", "dung quang ban snippets", "dung quang lam snippets", "dung quang uan snippets", "dung quang lan slippers"
"dung vbug code snippets" » "dung vung code snippets", "dung vbug code slippers", "dung vbung code snippets", "dung vbugs code snippets"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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