Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
khong cong » thong cong, khong cang, chong cong
thien anh » thien danh, tien anh, thien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung cua » truong cua, trung cap, dung cua
cong doan » cong dan, cong hoan, dong doanh
doan phan » doanh phan, toan phan, dan phan

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

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