Perhaps you should try some spelling variations:
"using java java snippets" » "using data java snippets", "using java java slippers"
"do cong tac snippets" » "do cong ty snippets", "doi cong tac snippets", "do hong tac snippets", "bo cong tac snippets", "do cong tac slippers"
"locating bug code snippets" » "locating bug code slippers", "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: "((((\"using java java snippets\") OR (\"do cong tac snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using java java snippets ) OR ( do cong tac snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using java java snippets") OR ("do cong tac snippets"))) OR ("locating bug code snippets"))*.