Perhaps you should try some spelling variations:
"vu truong hop snippets" » "vu truong hoc snippets", "vu truong hoi snippets", "vu truong lop snippets", "vu trong hop snippets", "vu thuong hop snippets", "va truong hop snippets"
"using data java snippets" » "using java java snippets", "using sat java snippets", "missing data java snippets"
"locating bug code snippets" » "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: "((((\"vu truong hop snippets\") OR (\"using data java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( vu truong hop snippets ) OR ( using data java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vu truong hop snippets") OR ("using data java snippets"))) OR ("locating bug code snippets"))*.