Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cua nhung » va nhung
canh ban » can ban, canh dan, canh van
tan toan » tap toan, van toan, dan toan
ban cua » ban quan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet tach - canh ban cua nhung cong ((tan toan) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - canh ban cua nhung cong ((tan toan) OR (tan tran)) cau*.