Perhaps you should try some spelling variations:
"creating cua toan snippets" » "creating _ toan snippets", "creating cuu toan snippets", "creating xuan toan snippets", "creating cua thanh snippets"
"creating a c snippets" » "creating _ c snippets", "reading a c snippets", "creating a c1 snippets", "creating a co snippets", "creating va c 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: (((("creating cua toan snippets") or ("creating a c snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("creating cua toan snippets") OR ("creating a c snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( creating cua toan snippets ) or ( creating a c snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("creating cua toan snippets") or ("creating a c snippets"))) or ("locating bug code snippets"))*.