Perhaps you should try some spelling variations:
hanh trung » thanh trung, hanh trang, manh trung
nhat hieu » nhat chieu, nha hieu, nhat bieu
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
dong cong » duong cong, dung cong, cong cong
dang cong » dung cong
tac toan » tap toan, hach toan, tich toan
tam toan » tap toan, tam than, pham toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: nhat hieu lang - hanh trung cua ((dong cong) or (dang cong)) ((tac toan) or (tam toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nhat hieu lang - hanh trung cua ((dong cong) OR (dang cong)) ((tac toan) OR (tam toan)) cau.
• Adding a wildcard symbol may retrieve word variants: nhat hieu lang - hanh trung cua ((dong cong) or (dang cong)) ((tac toan) or (tam toan)) cau*.