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