Perhaps you should try some spelling variations:
tuong quan » truong quan, thong quan, luong quan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tuong qua » duong qua, thong qua, trong qua
ho thiet » hoa thiet, so thiet, hoc thieu
cong tan » cong tac, cong san, cong thanh
tan ca » tan cua, tang ca, dan ca
ca cau » cua cau, cac cau, can cau

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 - thanh ((tuong qua) OR (tuong quan)) trong cong tan ca cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho thiet) or (hoc thiet)) tach - thanh ((tuong qua) OR (tuong quan)) trong cong tan ca cau~".
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoc thiet)) tach - thanh ((tuong qua) OR (tuong quan)) trong cong tan ca cau*.