Perhaps you should try some spelling variations:
"tran doan chat snippets" » "trang doan chat snippets", "tan doan chat snippets", "tran hoan chat snippets", "tran don chat snippets", "tran doan chuan snippets", "tran doanh chau 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"

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: (((("tran doan chat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("tran doan chat snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( tran doan chat snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("tran doan chat snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.