Perhaps you should try some spelling variations:
quan nhung » qua nhung, cua nhung, luan chung
chieu sang » chieu sach, chieu xanh, nhieu tang
nhung cong » dung cong, thong cong, hang cong
hieu lang » hieu quang, nhieu tang, hieu van
hanh dong » anh dong, ha dong
dong quan » duong quan, dong quang, dung quan
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 ((chieu sang) or (hieu lang)) - hanh dong quan nhung cong ((van toan) OR (van thanh)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sang) OR (hieu lang)) - hanh dong quan nhung cong ((van toan) OR (van thanh)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu sang) or (hieu lang)) - hanh dong quan nhung cong ((van toan) OR (van thanh)) ban".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sang) or (hieu lang)) - hanh dong quan nhung cong ((van toan) OR (van thanh)) ban*.