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