Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trung chan » trung phan, trung can, trung nhan
trong chan » trong chuan, trong cham, trong can
hoc thieu » toc thieu, hoc hien
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap

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 ((trung chan) or (trong chan)) dung cong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((trung chan) OR (trong chan)) dung cong tac toan cao*.