Perhaps you should try some spelling variations:
"vu trinh toan slippers" » "vu tinh toan slippers", "vu thanh toan slippers", "vu trinh han slippers", "va trinh toan slippers", "qua trinh toan slippers", "quy trinh toan slippers", "vu trinh toan slippery", "vu trinh toan grippers"
"using java java snippets" » "using 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 trinh toan slippers\") OR (\"using java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( vu trinh toan slippers ) OR ( using java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("vu trinh toan slippers") OR ("using java java snippets"))) OR ("locating bug code snippets"))*.