Perhaps you should try some spelling variations:
"trinh toan code snippets" » "tinh toan code snippets", "thanh toan code snippets", "trinh han code snippets", "trinh toan co snippets", "trinh toan cong snippets", "trinh toan de snippets"
"dong san code snippets" » "cong san code snippets", "dong bang code snippets", "dong von code snippets", "dong san co snippets", "dong san cong snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

Try widening your search to All Fields.

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