Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, nghiep nganh
thanh tung » thanh cong
hieu manh » chieu xanh, dieu hanh, hien hanh
cua trong » cua truong, cua trung, qua trong
cong luan » cong tuan, dong luan, cong luong
tong luan » tang luan, dung luan, hang luan
tung cua » trung cua, tuong cua, dung cua
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (hieu nganh)) - thanh tung cua trong ((cong luan) or (tong luan)) phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - thanh tung cua trong ((cong luan) OR (tong luan)) phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - thanh tung cua trong ((cong luan) or (tong luan)) phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - thanh tung cua trong ((cong luan) or (tong luan)) phan cau*.