Perhaps you should try some spelling variations:
"tang cau chap snippets" » "tang cau code snippets", "hang cau chap snippets", "bang cau chap snippets", "tang ca chap snippets", "tang cau cham snippets", "tang cau chan snippets", "tang cau phap 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 ("tang cau chap snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("tang cau chap snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( tang cau chap snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("tang cau chap snippets"))) or ("locating bug core snippets"))*.