Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh chau » thanh cha, thanh cham, thanh chu
hien xanh » hien hanh, hien nhanh, chieu xanh
cong dang » cong dong, cong dan, cong danh
cong dung » cuong dung, cong dong, cong luong
trung ca » trung cap, truong ca, trung cua
ca hang » cua hang, ca chang, va hang

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) or (dieu hanh)) - thanh trung ca hang ((cong dang) OR (cong dung)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (dieu hanh)) - thanh trung ca hang ((cong dang) OR (cong dung)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (dieu hanh)) - thanh trung ca hang ((cong dang) OR (cong dung)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (dieu hanh)) - thanh trung ca hang ((cong dang) OR (cong dung)) thanh chau*.