Perhaps you should try some spelling variations:
"trinh tren anh snippets" » "trinh truyen anh snippets", "trinh tuyen anh snippets", "trinh tieng anh snippets", "trinh tren lanh snippets", "trinh tran anh snippets", "trinh tien anh snippets", "trinh tren anh slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua 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 tren anh snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh tren anh snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tren anh snippets ) or ( dung cua code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tren anh snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.