Perhaps you should try some spelling variations:
"trinh luan chat snippets" » "trinh luan code snippets", "trinh luat chat snippets", "trinh quan chat snippets", "trinh han chat snippets", "trinh luan chi snippets", "trinh van chat snippets", "trinh luan phan snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java 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: (((("dung java java snippets") or ("trinh luan chat snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("trinh luan chat snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( trinh luan chat snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("trinh luan chat snippets"))) or ("locating bug core snippets"))*.