Perhaps you should try some spelling variations:
"using java code snippets" » "using data code snippets", "using java core snippets", "using java code slippers"
"ngoc toan lua snippets" » "ngoc tuan lua snippets", "ngoc tan lua snippets", "ngoc thanh lua snippets", "ngoc toan luan snippets", "ngoc toan luat snippets", "ngoc toan cua snippets", "ngoc toan lua slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: "((((\"using java code snippets\") OR (\"ngoc toan lua snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java code snippets ) OR ( ngoc toan lua snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java code snippets") OR ("ngoc toan lua snippets"))) OR ("locating bug code snippets"))*.