Perhaps you should try some spelling variations:
"trinh quan code snippets" » "tinh quang code snippets", "trinh luat code snippets", "trinh han code snippets", "trinh quan che snippets", "trinh quan co snippets", "trinh quan code slippers"
"dung qua dat snippets" » "duong qua dat snippets", "dung quan dat snippets", "dung cua dat snippets", "dung quy dat snippets", "dung qua da snippets", "dung qua dan snippets", "dung qua dat 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 quan code snippets") or ("dung qua dat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh quan code snippets") OR ("dung qua dat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh quan code snippets ) or ( dung qua dat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh quan code snippets") or ("dung qua dat snippets"))) or ("locating bug code snippets"))*.