Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
khoa hoc » hoa hoc
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
hanh di » hanh vi, hanh de, hang di
cua cau » cua cac, cua chu, cua cay
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y nang ((khoa hoc) or (co hoc)). hieu ve cac vuc van hanh di cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y nang ((khoa hoc) OR (co hoc)). hieu ve cac vuc van hanh di cua cau*.