Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
trung chan » trung phan, trong chan, trung can
hoc thieu » toc thieu, hoc hien
trong can » trong canh, trong chan, trong cac
dung cong » dung trong
cong thuc » cong tac
thuc toan » thuc trang, thuat toan, thuc thanh
toan tap » toan ban

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 can)) dung cong thuc toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - thanh ((trung chan) OR (trong can)) dung cong thuc toan tap.
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - thanh ((trung chan) or (trong can)) dung cong thuc toan tap*.