Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach vu » sach va, sach tu, sach uu
cho hoc » khoa hoc
hieu ve » hieu va, hieu van
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
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: te sach vu ngan ((cho hoc) or (co hoc)). hieu ve cac vuc van hanh vi cua cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu ngan ((cho hoc) OR (co hoc)). hieu ve cac vuc van hanh vi cua cac*.