Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong cham » phuong phap, phuong thao
hieu nganh » vien nganh, hiem ngan, nghiep nganh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, dieu hanh, hien hanh
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
cong bang » cuong bang, dong bang, hong bang
huong cau » thuong chau, huong dan, huong cua

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 trung cua nhung cong bang ((phuong cham) or (huong cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - thanh trung cua nhung cong bang ((phuong cham) OR (huong cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - thanh trung cua nhung cong bang ((phuong cham) or (huong cau))".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - thanh trung cua nhung cong bang ((phuong cham) or (huong cau))*.