Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu xanh » chieu sach, chieu sang, chieu tinh
doi chieu » doc hieu, doi chi, ho chieu
trong van » trong cac
lap dung » lan dung, cap dung, lam dung
ap dung » xay dung, van dung
van tan » van tuan, van ban, van tai
tan ban » toan ban, tang ban, van ban

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: doi chieu xanh - thanh trung ((lap dung) OR (ap dung)) trong van tan ban~.
• Adding a wildcard symbol may retrieve word variants: doi chieu xanh - thanh trung ((lap dung) or (ap dung)) trong van tan ban*.