Perhaps you should try some spelling variations:
"trinh tren duc snippets" » "trinh truyen duc snippets", "trinh tuyen duc snippets", "trinh tieng duc snippets", "trinh tran duc snippets", "trinh ren duc snippets", "trinh tien duc snippets", "trinh tren duc 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 tren duc 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 tren duc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh tren duc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh tren duc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.