Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"using java java snippets" » "using data java snippets"
"van thi van snippets" » "van tai van snippets", "dan thi van snippets", "van thu van snippets", "van thi lan snippets", "van thi hanh snippets", "van thi nang 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 thi van snippets\") OR (\"using java java snippets\"))) OR (\"locating bug core snippets\"))~".
• Removing quotes may allow a broader search: (((( van thi van snippets ) OR ( using java java snippets ))) OR ( locating bug core snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("van thi van snippets") OR ("using java java snippets"))) OR ("locating bug core snippets"))*.