Perhaps you should try some spelling variations:
"dai doi trinh snippets" » "dai doc trinh snippets", "dai doi tinh snippets", "dai dong trinh snippets", "dai hoi trinh snippets", "dai moi trinh snippets", "mai doi trinh snippets", "dai doi 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: (((("dai doi 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: (((("dai doi trinh snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dai doi trinh snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dai doi trinh snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.