Perhaps you should try some spelling variations:
"coating bang cot snippets" » "cong bang cot snippets", "coating bang cong snippets", "coating tong cot snippets", "coating bang cac snippets"
"dong dung cac snippets" » "dong duong cac snippets", "duong dung cac snippets", "cong dung cac snippets", "dong luong cac snippets", "dong dung cho snippets", "dong dung tai snippets"
"locating bug code snippets" » "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: (((("coating bang cot snippets") or ("dong dung cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("coating bang cot snippets") OR ("dong dung cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( coating bang cot snippets ) or ( dong dung cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("coating bang cot snippets") or ("dong dung cac snippets"))) or ("locating bug code snippets"))*.