Perhaps you should try some spelling variations:
"trinh thanh thuc snippets" » "tinh thanh thuc snippets", "trinh han thuc snippets", "trinh toan thuc snippets", "trinh thanh thuy snippets", "trinh nhanh thuc snippets", "trinh thach thuc snippets", "trinh thanh thuc slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh thanh thuc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh thanh thuc snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh thanh thuc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.