Perhaps you should try some spelling variations:
"vi duong code snippets" » "vi duong co snippets", "vi duong cong snippets", "vi duong che snippets", "vi luong code snippets", "va duong code snippets", "vu duong code snippets", "vi duong code slippers"
"using _ java snippets" » "using _ java slippers"
"locating bug code 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 snippets\") OR (\"vi duong code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( using _ java snippets ) OR ( vi duong code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("using _ java snippets") OR ("vi duong code snippets"))) OR ("locating bug code snippets"))*.