Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van ban
ngan cho » ngang cho, ngang tho, nganh che
van anh » van thanh, tuan anh, van minh
cac vuc » cac nuoc, cac vung, cac cuoc
hieu ve » hieu va, hieu van
cho hoc » co hoc, khoa hoc
cac thu » cach thuc, cac thoi
cua cau » cua cac, cua chu, cua cay
cac tu » cach tu, cac du, tac tu
ve cac » va cac, vien cac
di cua » dai cua, doi cua, de 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: hoc ((cac tu) OR (cac thu)) ngan cho hoc. hieu ve cac vuc ((van hanh) OR (van anh)) di cua cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((cac tu) OR (cac thu)) ngan cho hoc. hieu ve cac vuc ((van hanh) or (van anh)) di cua cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((cac tu) OR (cac thu)) ngan cho hoc. hieu ve cac vuc ((van hanh) or (van anh)) di cua cau*.