Perhaps you should try some spelling variations:
"trong hoc chan snippets" » "truong hoc chan snippets", "tuong hoc chan snippets", "trong hoa chan snippets", "trong hoc phan snippets", "trong hoc chat snippets", "trong hoc can snippets"
"dung java java snippets" » "dung va 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: "((((\"trong hoc chan snippets\") OR (\"dung java java snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( trong hoc chan snippets ) OR ( dung java java snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("trong hoc chan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.