Perhaps you should try some spelling variations:
"tran hoang cac snippets" » "quan hoang cac snippets", "tran quang cac snippets", "tranh hang cac snippets", "tran hang cac snippets", "tran hoang cao snippets", "tran khoang cach snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("tran hoang cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran hoang cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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