Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ngan cho » ngang cho, ngang tho, nganh che
van hanh » van thanh, ban hanh, van anh
cac vuc » cac nuoc, cac vung, cac cuoc
cua cau » cua cac, cua cay, cua can
vuc van » duc van, luc van, thuc van
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
uu ngan » vu ngan, tu ngan, cua ngan
cua chu » sua chua
ve cac » va cac, vien 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)) uu ngan cho hoc. hieu ve cac vuc van hanh vai ((cua cau) OR (cua chu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) uu ngan cho hoc. hieu ve cac vuc van hanh vai ((cua cau) or (cua chu))~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) uu ngan cho hoc. hieu ve cac vuc van hanh vai ((cua cau) or (cua chu))*.