Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
thanh tung » thanh cong
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
tung cua » trung cua, tuong cua, dung cua
cua dung » cua dang, cua dong, qua dung
tan toan » tap toan, dan toan, tam toan
van toan » van tuan, van tan, van thanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu xanh - thanh tung cua dung cong ((((tan toan) OR (van toan))) or (tan tran)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh tung cua dung cong ((((tan toan) OR (van toan))) OR (tan tran)) ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - thanh tung cua dung cong ((((tan toan) OR (van toan))) or (tan tran)) ban*".