Perhaps you should try some spelling variations:
"dung quang ho snippets" » "dang quang ho snippets", "luong quang ho snippets", "dung luan ho snippets", "dung quang hoi snippets", "dung quang hoc snippets", "dung quang pho snippets"
"hanh java java snippets" » "hanh va java 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: "((((\"hanh java java snippets\") OR (\"dung quang ho snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( hanh java java snippets ) OR ( dung quang ho snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("hanh java java snippets") OR ("dung quang ho snippets"))) OR ("locating bug code snippets"))*.