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