Perhaps you should try some spelling variations:
thieu xanh » chieu xanh, hieu manh, thien anh
hoc thieu » toc thieu, hoc hien
nang quan » ban quan, nang suat
tang quan » tang luan, tong quan, thong quan
dung cong » dung trong
van thanh » ban thanh, van tuan
van toan » van tuan, van tan, manh toan

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 - tinh ((nang quan) or (tang quan)) dung cong ((van toan) OR (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu xanh - tinh ((nang quan) OR (tang quan)) dung cong ((van toan) OR (van thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu xanh - tinh ((nang quan) or (tang quan)) dung cong ((van toan) OR (van thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc thieu xanh - tinh ((nang quan) or (tang quan)) dung cong ((van toan) OR (van thanh)) ban*.