Perhaps you should try some spelling variations:
"dong tranh do snippets" » "dong thanh do snippets", "dong trinh do snippets", "trong tranh do snippets", "dong trang do 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"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dong tranh do snippets\") OR (\"dung using java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dong tranh do snippets ) OR ( dung using java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dong tranh do snippets") OR ("dung using java snippets"))) OR ("locating bug code snippets"))*.