Perhaps you should try some spelling variations:
"dung tran trong snippets" » "dung gian trong snippets", "dung quan trong snippets", "dung tren trong snippets", "hung tran trong snippets", "dang tran trong snippets", "dung tran trong 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"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung vbug code snippets") or ("dung tran trong snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung vbug code snippets") or ("dung tran trong snippets"))) or ("locating bug code snippets"))*.