Perhaps you should try some spelling variations:
"trung dai lan snippets" » "truong dai lan snippets", "truong dao lan snippets", "trung tam lan snippets", "trung dai luan snippets", "trung dai han snippets", "trung dam lan snippets", "trung dai lan 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: (((("trung dai lan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trung dai lan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung dai lan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung dai lan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.