Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh di » hanh vi, hanh de, hang di
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
van cac » van hac, van cau, van bac
cho hoc » khoa hoc
ty nang » ky nang, ty xang, ty hang
cua chu » sua chua
di cua » dai cua, doi cua, de 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) OR (toc sach)) ty nang ((cho hoc) or (co hoc)). hieu van cac vuc van hanh di cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ((cho hoc) OR (co hoc)). hieu van cac vuc van hanh di cua chu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang ((cho hoc) or (co hoc)). hieu van cac vuc van hanh di cua chu*".