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