Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
xang cho » sang cho, hang cho, tang cho
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
vuc van » duc van, luc van, thuc van
cua cau » cua cac, cua chu, cua can
hieu va » lieu va, hieu qua
cac vuc » cac nuoc, cac vung, cac cuoc
cho hoc » co hoc, khoa hoc
cua cay » cua cac

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: ((te sach) OR (toc sach)) ty xang cho hoc. hieu va cac vuc van hanh vai ((cua cau) OR (cua cay))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty xang cho hoc. hieu va cac vuc van hanh vai ((cua cau) or (cua cay))~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty xang cho hoc. hieu va cac vuc van hanh vai ((cua cau) or (cua cay))*.