Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
thien hach » thien thanh, hien hanh
tuong cua » truong cua, huong cua, thong cua
dung cong » dung trong
hieu van » hieu va, thien van, lieu va
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien hach) or (hieu van)) - thanh tuong cua ((dang cong) or (dung cong)) tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hieu van)) - thanh tuong cua ((dang cong) OR (dung cong)) tac toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hieu van)) - thanh tuong cua ((dang cong) or (dung cong)) tac toan cau*.