Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hang cao » hoang cao, nang cao, hang ca
van cac » van hac, van cau, van bac
cua cau » cua cac, cua cay, cua can
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
sach ty » sach tu, sach thu, xach tay
cao hoc » co hoc, cho hoc, chat hoc
cua chu » sua chua

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ty) OR (sach y)) hang cao hoc. hieu van cac vuc van hanh vi ((cua cau) OR (cua chu))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) OR (sach y)) hang cao hoc. hieu van cac vuc van hanh vi ((cua cau) or (cua chu))~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) OR (sach y)) hang cao hoc. hieu van cac vuc van hanh vi ((cua cau) or (cua chu))*.