Perhaps you should try some spelling variations:
"van duong code snippets" » "van duong co snippets", "van duong cong snippets", "van duong che snippets", "van dong code snippets", "van dung code snippets", "van phong code snippets"
"using raw java snippets" » "using real java snippets", "using a java snippets", "using low 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 raw java snippets\") OR (\"van duong code snippets\"))) OR (\"locating bug code slippers\"))~".
• Removing quotes may allow a broader search: (((( using raw java snippets ) OR ( van duong code snippets ))) OR ( locating bug code slippers ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using raw java snippets") OR ("van duong code snippets"))) OR ("locating bug code slippers"))*.