Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
thong cong » trong cong, tong cong, thong thong
hien xanh » hien hanh, hien nhanh, chieu xanh
trung cua » truong cua, trung cap, dung cua
van thanh » ban thanh, van tuan
van than » van thang, van tuan, van phan

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

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