Perhaps you should try some spelling variations:
"tran tuong cao snippets" » "tran trong cao snippets", "tran thong cao snippets", "tran tung cao snippets", "tran truong cao snippets", "tran duong cao snippets", "tran luong cao snippets"
"dung va java snippets" » "dung java 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: "((((\"tran tuong cao snippets\") OR (\"dung va java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( tran tuong cao snippets ) OR ( dung va java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("tran tuong cao snippets") OR ("dung va java snippets"))) OR ("locating bug code snippets"))*.