Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
thiet danh » thien danh, thien anh, thien dang
trung tuan » trung thanh, trung tam, tran tuan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung cap, dung cua
cong dan » cong san, cong tan, huong dan
dan hanh » dang hanh, dan khanh, dan thanh
hanh cau » nhanh cau, hang cau, hanh cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet danh - thanh ((trung cua) or (trung tuan)) thuong cong dan hanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - thanh ((trung cua) OR (trung tuan)) thuong cong dan hanh cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - thanh ((trung cua) or (trung tuan)) thuong cong dan hanh cau*.