Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
chat hoc » chat hoa, chat thom, vat hoc
van hanh » van thanh, ban hanh, van anh
cho hoc » co hoc, khoa hoc
hieu ve » hieu va, hieu van
cac duc » cac du, cao duc, cac dac
duc van » duc va, duc tan, duc manh
cua cau » cua cac, cua chu, cua cay
y nang » ky nang, ly nang, v nang
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.

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