Perhaps you should try some spelling variations:
thuoc sach » nuoc sach, thuat sach, thuoc sinh
van hanh » van thanh, ban hanh, van anh
hoc sach » hoc sinh, hoc cac, hoc anh
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cao hoc » co hoc, chat hoc
ly nang » ky nang, ly hang, ly vang
cua cau » cua cac, cua chu, cua cay
ve cac » va cac, vien cac
vi cua » vai cua, di cua

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: ((thuoc sach) OR (hoc sach)) ly nang ((cao hoc) OR (cho hoc)). hieu ve cac duc van hanh vi cua cau~.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (hoc sach)) ly nang ((cao hoc) or (cho hoc)). hieu ve cac duc van hanh vi cua cau*.