Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
trung cua » trung tuan, trung cap, dung cua
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - manh ((trung cua) OR (truong cua)) nhung cong ((tac toan) OR (tap toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - manh ((trung cua) or (truong cua)) nhung cong ((tac toan) OR (tap toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - manh ((trung cua) or (truong cua)) nhung cong ((tac toan) OR (tap toan)) cau*.