Perhaps you should try some spelling variations:
"trinh giang van snippets" » "trinh giao van snippets", "trinh giai van snippets", "trinh tieng van snippets", "trinh hoang van snippets", "trinh dang van snippets", "trinh gian dan snippets", "trinh giang van 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: (((("trinh giang van snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh giang van snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh giang van snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh giang van snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.