Perhaps you should try some spelling variations:
"dao doanh chat snippets" » "dao doanh code snippets", "dao doanh chau snippets", "dao doanh nhat snippets", "dao doanh nhan snippets", "cao doanh chat snippets", "dao danh chat snippets", "dao thanh chat 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 ("dao doanh 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 ("dao doanh chat snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dao doanh chat snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dao doanh chat snippets"))) or ("locating bug core snippets"))*.