Perhaps you should try some spelling variations:
"trac cong tinh slippers" » "tran cong tinh slippers", "tra cong tinh slippers", "trao cong tinh slippers", "trac cong trinh slippers", "trac cong vinh slippers", "trac cong thanh slippers", "trac cong tinh slippery", "trac cong tinh grippers"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "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: (((("trac cong tinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trac cong tinh slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trac cong tinh slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trac cong tinh slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.