Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
van hanh » van thanh, ban hanh, van anh
va hanh » va thanh, va danh, ban hanh
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
van hoe » van hoa, van hoc, van hieu
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac

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 nganh ((ky tang) OR (ky dang)) van hoe. hieu ve cac dac ((va hanh) OR (van hanh)) dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky tang) or (ky dang)) van hoe. hieu ve cac dac ((va hanh) OR (van hanh)) dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky tang) or (ky dang)) van hoe. hieu ve cac dac ((va hanh) OR (van hanh)) dai cua tre*.