Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
hien danh » thien danh, hien hanh, hien nhanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
thong dan » thong van, thong den, trong dan
tuong dan » huong dan, tung dan, xuong dan
phan cau » phan dau, phan cac, phan tu

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