Perhaps you should try some spelling variations:
"luong duoc co snippets" » "luong cuoc co snippets", "luong duc co snippets", "luong nuoc co snippets", "luong duoc hoc snippets", "luong duong co snippets", "luong duoc hoi snippets"
"dung using java snippets" » "dung ung java snippets", "dung sinh java snippets", "dung uong java snippets", "dung using data 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: (((("luong duoc co snippets") or ("dung using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("luong duoc co snippets") OR ("dung using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luong duoc co snippets ) or ( dung using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luong duoc co snippets") or ("dung using java snippets"))) or ("locating bug code snippets"))*.