Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dong anh he snippets" » "hong anh he snippets", "dong thanh he snippets", "hoang anh he snippets", "dong hanh he snippets", "dong anh ha snippets", "dong anh ve 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 anh he 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 anh he snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dong anh he snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dong anh he snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.