Perhaps you should try some spelling variations:
te sach » toc sach
cho hoc » khoa hoc
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
van anh » van thanh, tuan anh, van minh
cua cau » cua cac, cua chu, cua cay
y nang » ky nang, ly nang, v nang
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((cho hoc) or (co hoc)). hieu va cac duc van anh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((cho hoc) OR (co hoc)). hieu va cac duc van anh vi cua cau*.