Perhaps you should try some spelling variations:
"dong chung cach snippets" » "dong chung code snippets", "dung chung cach snippets", "cong chung cach snippets", "dong hung cach snippets", "dong phuong cach snippets", "dong phong cach snippets", "dong cung cac 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 chung 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: (((("dong chung cach snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dong chung cach snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong chung cach snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.