Perhaps you should try some spelling variations:
"cong trinh code snippets" » "cong trinh cong snippets", "cong trinh co snippets", "cong trinh cad snippets", "cong trinh code slippers"
"dung quang dat snippets" » "dang quang dat snippets", "luong quang dat snippets", "dung luan dat snippets", "dung quang dai snippets", "dung quang dam snippets", "dung quang phat snippets", "dung quang dat slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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