Perhaps you should try some spelling variations:
"nhung tri thiet snippets" » "nhung bai thiet snippets", "nhung bi thiet snippets", "nhung gi thiet snippets", "nhung tai thiet snippets", "nhung trinh thiet snippets", "nhung troi nhiet snippets", "nhung tri thiet 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: (((("nhung tri thiet snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nhung tri thiet snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nhung tri thiet snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nhung tri thiet snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.