Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
van hoi » van hoa, van hoc, van hoe
ky tang » ky nang, ky dang, kho tang
van cac » van hac, van cau, van bac
cac duc » cac du, cao duc, cac dac
va hanh » va thanh, va danh, ban hanh
ky lang » ky nang, ky dang, tay lang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu van cac duc ((va hanh) or (van hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu van cac duc ((va hanh) OR (van hanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu van cac duc ((va hanh) or (van hanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) OR (ky tang)) van hoi. hieu van cac duc ((va hanh) or (van hanh)) hai cua tre*.