Perhaps you should try some spelling variations:
"trung dai cu snippets" » "truong dai cu snippets", "truong dao cu snippets", "trung tam cu snippets", "trung dai cua snippets", "trung dai tu snippets", "trung dai xu snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("trung dai cu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trung dai cu snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trung dai cu snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trung dai cu snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.