Perhaps you should try some spelling variations:
"cong nhap cong snippets" » "cong nhap code snippets", "cong nhan cong snippets", "cong nhat cong snippets", "cong nha cong snippets", "cong phap cong snippets", "cong phap chong snippets", "cong phan 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 nhap 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 nhap cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( cong nhap cong snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong nhap cong snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.