Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
thien anh » thien danh, thien thanh, thien chanh
trung cua » truong cua, trung cap, dung cua
tien anh » tieng anh, tien manh, dien anh
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cao » toan ban, toan tap

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 (tien anh)) - hanh ((trung cua) or (trung tuan)) nhung cong dan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien anh) OR (tien anh)) - hanh ((trung cua) OR (trung tuan)) nhung cong dan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien anh) OR (tien anh)) - hanh ((trung cua) or (trung tuan)) nhung cong dan toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien anh) OR (tien anh)) - hanh ((trung cua) or (trung tuan)) nhung cong dan toan cao*.