Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
dung phuong » dung thuong, bang phuong, dung chung
phuong dan » phuong danh, phuong doan, huong dan
hieu manh » chieu xanh, hieu nganh, dieu hanh
trung ha » trung hoc, trung tam, trung cap
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap
ha dung » hai dung, kha dung, nha dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) or (thien thanh)) - thanh trung ha dung phuong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (thien thanh)) - thanh trung ha dung phuong dan toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (thien thanh)) - thanh trung ha dung phuong dan toan cau*.