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