Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
cach dung » sach dung, cach mang, tac dung
trong san » trong cac, cong san, dong san
trong tan » trong quan, trong cac, trong ca
dung cua » dung luan, dung cho
cua dong » chua dong, cua cong, cua dang
toan cau » toan cao, toan tap, toan tai
toan ban » van 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 - cach dung cua dong ((trong san) or (trong tan)) ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - cach dung cua dong ((trong san) OR (trong tan)) ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - cach dung cua dong ((trong san) or (trong tan)) ((toan cau) or (toan ban))*.