Perhaps you should try some spelling variations:
"trinh doc cham snippets" » "trinh do cham snippets", "trinh hoa cham snippets", "trinh co cham snippets", "trinh toc cham snippets", "trinh doc chat snippets", "trinh moc cham snippets"
"trong cac code snippets" » "trong cac cong snippets", "trong cac co snippets", "trong cac che snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code 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: "((((\"trinh doc cham snippets\") OR (\"trong cac code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( trinh doc cham snippets ) OR ( trong cac code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("trinh doc cham snippets") OR ("trong cac code snippets"))) OR ("locating bug code snippets"))*.