Perhaps you should try some spelling variations:
"trinh cam chet snippets" » "trinh cham chet snippets", "trinh cau chet snippets", "trinh tam chet snippets", "trinh cai chet snippets", "trinh cam thiet snippets", "trinh chai chet snippets"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug core snippets"
"locating bug 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: (((("trinh cam chet snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cam chet snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cam chet snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cam chet snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.