Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh trung » thanh trung, hanh trang, manh trung
trong hanh » trong thanh, trong anh, trong danh
trong canh » trong anh, trong cach, trong can
trung cua » truong cua, trung tuan, trung cap
cua thang » cua hang, cua thanh, xua thang
toan cau » toan cao, toan ban, toan tap

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

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