Perhaps you should try some spelling variations:
"tran hoc chat snippets" » "tran hoc code snippets", "toan hoc chat snippets", "than hoc chat snippets", "trac hoc chat snippets", "tran hoc phat snippets", "tran hoc cao snippets", "tran hoc phan snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung java java snippets") or ("tran hoc chat snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tran hoc chat snippets"))) OR ("locating bug core snippets")).
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