Perhaps you should try some spelling variations:
"thanh van trinh snippets" » "thanh san trinh snippets", "thanh toan trinh snippets", "thanh phan trinh snippets", "thanh van thinh snippets", "thanh van tinh snippets", "thanh dan trinh snippets", "thanh van trinh slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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