Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
thanh tung » thanh cong
trong dan » trong dang, trong san, trong tan
chinh cau » chinh chau, chinh ca, chinh can
ho chieu » theo chieu, hoc thieu, doi chieu
chan cau » phan cau, can cau, nhanh cau
tung ap » tang ap, tung dan, tung bay
ap dung » xay dung, van dung

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 sach - thanh tung ap dung trong dan ((chan cau) OR (chinh cau))~.
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - thanh tung ap dung trong dan ((chan cau) or (chinh cau))*.