Perhaps you should try some spelling variations:
"trinh xuan duc snippets" » "trinh quan duc snippets", "trinh luan duc snippets", "trinh luat duc snippets", "trinh tran duc snippets", "trinh phan duc snippets", "trinh xuan huy snippets", "trinh xuan duc slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code 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: (((("trinh xuan duc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh xuan duc snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh xuan duc snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh xuan duc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.