Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xang cho » sang cho, hang cho, tang cho
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu va » lieu va
sach tu » sach thu, cach tu, sach uu
cho hoc » co hoc, khoa hoc
sach ty » sach y, sach thu, xach tay
cua chu » sua chua
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 tu) OR (sach ty)) xang cho hoc. ((hieu va) or (hieu qua)) cac vuc van hanh vi cua chu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tu) OR (sach ty)) xang cho hoc. ((hieu va) OR (hieu qua)) cac vuc van hanh vi cua chu*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tu) OR (sach ty)) xang cho hoc. ((hieu va) or (hieu qua)) cac vuc van hanh vi cua chu*".