Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
cong quang » luong quang, thong quang, duong quang
hien xanh » hien hanh, hien nhanh, chieu xanh
trung cua » truong cua, trung cap, dung cua
quang van » quang ban, quan van, quang uan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien xanh - hanh ((trung cua) or (trung tuan)) nhung cong quang van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien xanh - hanh ((trung cua) OR (trung tuan)) nhung cong quang van ban*.