Perhaps you should try some spelling variations:
"dong cac code snippets" » "duong cac code snippets", "dong bac code snippets", "dung cac code snippets", "dong cac cong snippets", "dong cac co snippets", "dong cac che snippets", "dong cac code slippers"
"dung ung dat snippets" » "dung trung dat snippets", "dung quang dat snippets", "dung chung dat snippets", "dung dung dat snippets", "dung vung dat snippets", "dung cung dat snippets", "dung ung dat slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dong cac code snippets") or ("dung ung dat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong cac code snippets") OR ("dung ung dat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong cac code snippets ) or ( dung ung dat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong cac code snippets") or ("dung ung dat snippets"))) or ("locating bug code snippets"))*.