Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thong cong » trong cong, tong cong, thong thong
hien tach » thien hach, chiet tach, vien bach
cong cang » cong cong, cong lang, cong vang
thang cao » thong cao, nang cao, quang cao
thang lao » tang lao, thanh lap, thang loi
tuong va » truong va, thuong va, luong va
va thong » va thuong, va phuong, he thong

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 tuong va thong cong cang ((thang cao) or (thang lao))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - thanh tuong va thong cong cang ((thang cao) OR (thang lao)).
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - thanh tuong va thong cong cang ((thang cao) or (thang lao))*.