Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
thiet tach » chiet tach, thien hach, thuat tach
hanh nang » ganh nang, hanh mang, hanh trang
dung cong » dung trong
so thiet » soc thiet, hoc thiet, hoa thiet
anh nang » ganh nang, anh bang, anh dang
dan toan » van toan, dan than, manh toan
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: so thiet tach - ((hanh nang) or (anh nang)) cua ((nhung cong) or (dung cong)) dan toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - ((hanh nang) OR (anh nang)) cua ((nhung cong) OR (dung cong)) dan toan tap.
• Adding a wildcard symbol may retrieve word variants: so thiet tach - ((hanh nang) or (anh nang)) cua ((nhung cong) or (dung cong)) dan toan tap*.