Perhaps you should try some spelling variations:
"locating bugs code snippets" » "locating bug code snippets"
"using visual c snippets" » "using virtual c snippets", "bang visual c snippets", "situ visual c snippets", "using visual _ snippets"
"van tuan java snippets" » "van quan java snippets", "van ban java snippets", "anh tuan java 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: "((((\"van tuan java snippets\") OR (\"using visual c snippets\"))) OR (\"locating bugs code snippets\"))~".
• Removing quotes may allow a broader search: (((( van tuan java snippets ) OR ( using visual c snippets ))) OR ( locating bugs code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van tuan java snippets") OR ("using visual c snippets"))) OR ("locating bugs code snippets"))*.