Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
trong tac » trong cac, tuong tac, trong tan
nhung cau » chung cu, nhung bai, nhu cau
ho chieu » theo chieu, hoc thieu, doi chieu
cua dung » cua dang, cua dong, qua dung
hang cau » hang dau, hang ca, nang cao

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 - ((thanh tung) OR (anh huong)) cua dung trong tac ((hang cau) OR (nhung cau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - ((thanh tung) or (anh huong)) cua dung trong tac ((hang cau) OR (nhung cau))~".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - ((thanh tung) or (anh huong)) cua dung trong tac ((hang cau) OR (nhung cau))*.