Perhaps you should try some spelling variations:
"duoc bien cua snippets" » "duoc dien cua snippets", "duc bien cua snippets", "duoc thien cua snippets", "duoc bien sua snippets", "duoc bieu cua snippets", "duoc tien cua 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: (((("duoc bien cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duoc bien cua snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duoc bien cua snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duoc bien cua snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.