Perhaps you should try some spelling variations:
"trinh luat code snippets" » "trinh luat cong snippets", "trinh luat de snippets", "trinh luat code slippers"
"dung hoc code snippets" » "dong hoc code snippets", "dung thuoc code snippets", "trung hoc code snippets", "dung hoc co snippets", "dung hoc cong snippets", "dung hoc de snippets", "dung hoc 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 luat code snippets") or ("dung hoc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh luat code snippets") OR ("dung hoc code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh luat code snippets ) or ( dung hoc code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh luat code snippets") or ("dung hoc code snippets"))) or ("locating bug code snippets"))*.