Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
nhiet tach » chiet tach
hoc nhiet » hoc thiet, hoc nghien, hoc hien
canh manh » lanh manh, canh tranh, cach mang
dung cong » dung trong
manh cua » doanh cua, ban cua
van toan » van tuan, van tan, van thanh
toan ban » van ban

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nhiet tach - canh manh cua ((nhung cong) or (dung cong)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhiet tach - canh manh cua ((nhung cong) OR (dung cong)) van toan ban.
• Adding a wildcard symbol may retrieve word variants: hoc nhiet tach - canh manh cua ((nhung cong) or (dung cong)) van toan ban*.