Perhaps you should try some spelling variations:
thanh tung » thanh cong
thien hach » thien thanh, hien hanh
dang cong » dung cong
hieu cac » hieu luc, hieu va, hieu van
tung cua » trung cua, tuong cua, dung cua
cua dang » cua cong, cua ban
cong tam » cong tac, cong tan, cong nam
tam toan » tap toan, tam than, pham 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 cac)) - thanh tung cua dang cong tam toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien hach) OR (hieu cac)) - thanh tung cua dang cong tam toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien hach) or (hieu cac)) - thanh tung cua dang cong tam toan cau*.