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