Perhaps you should try some spelling variations:
"hai duong code snippets" » "hai duong co snippets", "hai duong cong snippets", "hai duong che snippets", "dai cuong code snippets", "hai phong code snippets"
"using a java snippets" » "using _ java snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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 a java snippets\") OR (\"hai duong code snippets\"))) OR (\"locating bug code slippers\"))~".
• Removing quotes may allow a broader search: (((( using a java snippets ) OR ( hai duong code snippets ))) OR ( locating bug code slippers ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using a java snippets") OR ("hai duong code snippets"))) OR ("locating bug code slippers"))*.