Perhaps you should try some spelling variations:
"van trinh san snippets" » "van thinh san snippets", "van tinh san snippets", "dan trinh san snippets", "van trinh han snippets", "van trinh van snippets", "van trinh quan snippets", "van trinh san 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: "((((\"van trinh san snippets\") OR (\"using _ java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( van trinh san snippets ) OR ( using _ java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van trinh san snippets") OR ("using _ java snippets"))) OR ("locating bug code snippets"))*.