Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
phuong tinh » phuong trinh, phuong binh, khuong tinh
thanh tung » thanh cong
ho thiet » hoc thiet, hoa thiet, so thiet
toan cau » toan cao, toan tap, toan tai
toan ban » van ban
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho thiet) or (hoa viet)) tach - thanh tung va nhung phuong tinh ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho thiet) OR (hoa viet)) tach - thanh tung va nhung phuong tinh ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: ((ho thiet) or (hoa viet)) tach - thanh tung va nhung phuong tinh ((toan cau) or (toan ban))*.