Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
hang cao » hoang cao, nang cao, hang ca
van cac » van hac, van cau, van bac
sach ty » sach y, sach thu, xach tay
cao hoc » co hoc, cho hoc, chat hoc
sach tu » sach thu, cach tu, sach uu
cua cau » cua cac, cua chu, cua cay
vi cua » vai cua, di cua

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 tu)) hang cao hoc. hieu van cac nuoc ((van hanh) OR (ban hanh)) vi cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ty) or (sach tu)) hang cao hoc. hieu van cac nuoc ((van hanh) OR (ban hanh)) vi cua cau~".
• Adding a wildcard symbol may retrieve word variants: te ((sach ty) or (sach tu)) hang cao hoc. hieu van cac nuoc ((van hanh) OR (ban hanh)) vi cua cau*.