Perhaps you should try some spelling variations:
"trinh nhan cay snippets" » "trinh han cay snippets", "trinh phan cay snippets", "trinh nha cay snippets", "trinh nhanh cay snippets", "trinh nham cay snippets", "trinh nhan cach 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: (((("dung bug code snippets") or ("trinh nhan cay snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung bug code snippets") OR ("trinh nhan cay snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung bug code snippets ) or ( trinh nhan cay snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung bug code snippets") or ("trinh nhan cay snippets"))) or ("locating bug code snippets"))*.