Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
dong cong » duong cong, dung cong, dang cong
vang toan » van toan, quang toan, vang trang
dang toan » dang tran, dan toan, dung toan
anh nang » ganh nang, anh bang, anh dang
nang dua » nang du, nang suat, nang quan
dua dong » cua dong, duc dong, duy dong

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 - anh nang dua dong cong ((vang toan) or (dang toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - anh nang dua dong cong ((vang toan) OR (dang toan)) cao*.