Perhaps you should try some spelling variations:
"trao hoc trinh snippets" » "trao doc trinh snippets", "trao hoc tinh snippets", "trao hoc sinh snippets", "thao hoc trinh snippets", "trac hoc trinh snippets", "trao ho trinh snippets", "trao hoc 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: (((("trao hoc 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: (((("trao hoc trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trao hoc trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.