Perhaps you should try some spelling variations:
"luong tri chat snippets" » "luong tri code snippets", "luong tai chat snippets", "luong thi chat snippets", "luong thai chat snippets", "luong tra chat snippets", "luong trinh chat snippets", "luong tri nhan 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: (((("luong tri chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong tri chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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