Perhaps you should try some spelling variations:
thanh tung » thanh cong
hien tach » thien hach, chiet tach, vien bach
cua thong » cua thuong, cua khong, cua tong
cong cang » cong cong, cong vang, cong bang
cong lang » cong vang, cong luong, cong quang
thang cao » thong cao, nang cao, quang cao
thang lao » tang lao, thanh lap, thang loi
tung cua » trung cua, tuong cua, dung cua

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 tach - thanh tung cua thong ((cong cang) or (cong lang)) ((thang cao) OR (thang lao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - thanh tung cua thong ((cong cang) OR (cong lang)) ((thang cao) OR (thang lao)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tach - thanh tung cua thong ((cong cang) or (cong lang)) ((thang cao) OR (thang lao))".
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - thanh tung cua thong ((cong cang) or (cong lang)) ((thang cao) OR (thang lao))*.