Perhaps you should try some spelling variations:
"dong quoc chan snippets" » "dang quoc chan snippets", "dong duoc chan snippets", "hoang quoc chan snippets", "dong buoc chan snippets", "dong quoc nhan snippets", "dong quoc khanh snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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 quoc chan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dong quoc chan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong quoc chan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong quoc chan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.