Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
sach nang » cach mang, sach dung, sach danh
dung cong » dung trong
dang toan » dang tran, dan toan, dung toan
nang dua » nang du, nang suat, nang quan
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 - sach nang dua ((trong cong) or (dung cong)) dang toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - sach nang dua ((trong cong) OR (dung cong)) dang toan cao*.