Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
chieu xanh » chieu sach, chieu sang, chieu tinh
cach dung » sach dung, cach mang, anh dung
cua nhung » va nhung
manh toan » thanh toan, anh tuan, tinh toan
ho chieu » theo chieu, hoc thieu, doi chieu
tac dung » sach dung, xay dung, tin dung
dan than » dan chan, ban than, van than

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho chieu xanh - ((cach dung) OR (tac dung)) cua nhung cong ((dan than) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - ((cach dung) OR (tac dung)) cua nhung cong ((dan than) or (manh toan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - ((cach dung) OR (tac dung)) cua nhung cong ((dan than) or (manh toan)) cau*.