Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
tranh cua » doanh cua, manh cua
ho thiet » hoa thiet, so thiet, hoc thieu
cong dan » cong san, cong tan, huong dan
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoc thiet)) tach - hanh ((trung cua) OR (tranh cua)) nhung cong dan toan tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) OR (hoc thiet)) tach - hanh ((trung cua) or (tranh cua)) nhung cong dan toan tap~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) OR (hoc thiet)) tach - hanh ((trung cua) or (tranh cua)) nhung cong dan toan tap*.