Perhaps you should try some spelling variations:
"dong dung chat snippets" » "dong dung code snippets", "dong duong chat snippets", "duong dung chat snippets", "cong dung chat snippets", "dong dung nhat snippets", "dong luong chat snippets", "dong dung cho 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: (((("dong dung chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong dung chat snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong dung chat snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong dung chat snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.