Perhaps you should try some spelling variations:
"viet trinh van snippets" » "viet trung van snippets", "viet thanh van snippets", "viet trong van snippets", "viet trinh han snippets", "viet trinh quan snippets", "viet trinh toan snippets", "viet trinh van slippers"
"using _ java snippets" » "using _ java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: "((((\"viet trinh van snippets\") OR (\"using _ java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( viet trinh van snippets ) OR ( using _ java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("viet trinh van snippets") OR ("using _ java snippets"))) OR ("locating bug code snippets"))*.