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
tuong cua » truong cua, huong cua, thong cua
cua thong » cua thuong, cua khong, cua tong
cong sang » cong san, cong lang, cong vang
toan cao » toan ban, toan tap
than so » than sao, than vo, than go

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