Perhaps you should try some spelling variations:
"trung anh trac snippets" » "truong anh trac snippets", "trang anh trac snippets", "trong anh trac snippets", "trung sinh trac snippets", "trung anh tuan snippets", "trung anh thuc snippets", "trung anh trac 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 anh trac 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 anh trac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung anh trac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung anh trac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.