Perhaps you should try some spelling variations:
"dung thanh toan snippets" » "dung thanh code snippets", "dong thanh toan snippets", "dang thanh toan snippets", "dung thang toan snippets", "dung thanh hoa snippets", "dung thanh san snippets", "dung tinh toan snippets"
"locating bug core snippets" » "locating bug code snippets"
"hang java java snippets" » "hang va java 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: (((("hang java java snippets") or ("dung thanh toan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("hang java java snippets") OR ("dung thanh toan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( hang java java snippets ) or ( dung thanh toan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hang java java snippets") or ("dung thanh toan snippets"))) or ("locating bug core snippets"))*.