Perhaps you should try some spelling variations:
"cong cau cong snippets" » "cong cau code snippets", "cong cu cong snippets", "cong chuc cong snippets", "thong cau cong snippets", "cong cac cong snippets", "cong cuu cong snippets", "cong cao cong snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("cong cau cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong cau cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong cau cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong cau cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.