Perhaps you should try some spelling variations:
"thuong thuc code snippets" » "thuong thuc co snippets", "thuong thuc con snippets", "truong thuc code snippets", "huong thuc code snippets", "thong thuc code snippets", "thuong thuc code slippers"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd 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: (((("thuong thuc code snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("thuong thuc code snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.