Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
trung tuan » trung thanh, tran tuan, truong thanh
khong cong » thong cong, khong cang, chong cong
hoc hieu » hoc thieu, hoc hien, doc hieu
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap

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 nganh - thanh ((trung tuan) OR (trung tam)) khong cong dan ((than cau) or (phan tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu nganh - thanh ((trung tuan) OR (trung tam)) khong cong dan ((than cau) OR (phan tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu nganh - thanh ((trung tuan) OR (trung tam)) khong cong dan ((than cau) or (phan tu))".
• Adding a wildcard symbol may retrieve word variants: hoc hieu nganh - thanh ((trung tuan) OR (trung tam)) khong cong dan ((than cau) or (phan tu))*.