Perhaps you should try some spelling variations:
"thong than hoc snippets" » "thong thanh hoc snippets", "thong phan hoc snippets", "thong nhan hoc snippets", "thong toan hoc snippets", "thong thai hoc snippets", "thong than doc snippets"
"dung java java slippery" » "dung va java slippery", "dung java java slippers"
"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: "((((\"dung java java slippery\") OR (\"thong than hoc snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung java java slippery ) OR ( thong than hoc snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung java java slippery") OR ("thong than hoc snippets"))) OR ("locating bug code snippets"))*.