Perhaps you should try some spelling variations:
"rong tho trinh snippets" » "rong tho tinh snippets", "rong tao trinh snippets", "rong thi trinh snippets", "trong tho trinh snippets", "rong cho trinh snippets", "trong thoi trinh snippets", "rong tho 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: (((("rong tho 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: (((("rong tho trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( rong tho trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("rong tho trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.