Perhaps you should try some spelling variations:
"cong toan thuc snippets" » "cong tan thuc snippets", "cong hoan thuc snippets", "cong tuan thuc snippets", "cong toan hoc snippets", "cong dan thuc snippets", "cong nhan thuc snippets", "cong toan thuc slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 toan thuc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong toan thuc snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong toan thuc snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong toan thuc snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.