Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
cho hoc » khoa hoc
van hac » van hoc, van ha, van hai
vuc van » duc van, luc van, thuc van
cua cau » cua cac, cua chu, cua cay
y nang » ky nang, ly nang, v nang
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) OR (doc sach)) y nang ((cho hoc) or (co hoc)). hieu van hac vuc van hanh vi cua cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang ((cho hoc) OR (co hoc)). hieu van hac vuc van hanh vi cua cau*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang ((cho hoc) or (co hoc)). hieu van hac vuc van hanh vi cua cau*".