Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh trung » thanh trung, hanh trang, manh trung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
tac toan » tam toan, hach toan, tich toan
tap toan » tap doan, tap quan, bai toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - hanh trung cua nhung cong ((tac toan) OR (tap toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - hanh trung cua nhung cong ((tac toan) OR (tap toan)) tap".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - hanh trung cua nhung cong ((tac toan) OR (tap toan)) tap*.