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