Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong tai den snippets" » "dung tai den snippets", "luong tai den snippets", "cong tac den snippets", "dong thai den snippets", "dong tai yen snippets", "dong tac den 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 tai den 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 tai den snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong tai den snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong tai den snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.