Perhaps you should try some spelling variations:
"trinh toan cua snippets" » "tinh toan cua snippets", "thanh toan cua snippets", "trinh han cua snippets", "trinh than cua snippets", "trinh tan cua snippets", "trinh doanh cua snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung java java snippets\") OR (\"trinh toan cua snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java snippets ) OR ( trinh toan cua snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") OR ("trinh toan cua snippets"))) OR ("locating bug code snippets"))*.