Perhaps you should try some spelling variations:
"dung hoc chat snippets" » "dung hoc code snippets", "dong hoc chat snippets", "dung thuoc chat snippets", "trung hoc chat snippets", "dung hoc phat snippets", "dung hoc cao snippets", "dung hoc phan snippets"
"locating bug core snippets" » "locating bug code snippets"
"hang java java snippets" » "hang 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 hoc chat snippets") or ("hang java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hoc chat snippets") OR ("hang java java snippets"))) OR ("locating bug core snippets")).
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