Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
truong cua » truong ca, truong quan, huong cua
truong cao » truong dai
nhung cong » dung cong, thong cong, hang cong
hoc thieu » toc thieu, hoc hien
hach toan » thanh toan, manh toan
tac toan » tap toan, tam toan, tich 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 ((truong cua) OR (truong cao)) nhung cong ((tac toan) OR (hach toan)) tap~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - manh ((truong cua) or (truong cao)) nhung cong ((tac toan) OR (hach toan)) tap~".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - manh ((truong cua) or (truong cao)) nhung cong ((tac toan) OR (hach toan)) tap*.