Perhaps you should try some spelling variations:
nhuong cong » nhung cong, luong cong, duong cong
trung phai » trung phan, trung hai, truong phan
trung phat » truong phat, trong phat, trung phan
hieu manh » chieu xanh, hieu nganh, dieu hanh
hach toan » thanh toan
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - thanh ((trung phai) OR (trung phat)) nhuong cong ((hach toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu manh - thanh ((trung phai) or (trung phat)) nhuong cong ((hach toan) OR (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - thanh ((trung phai) or (trung phat)) nhuong cong ((hach toan) OR (manh toan)) cau*.