Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hanh dai » hanh tai, hanh dao, vanh dai
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
cac dat » cac dan, cai dat, cac dai
va hanh » van hanh, va thanh, va danh
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 dang)) van hoa. hieu va cac dat va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ((ky lang) OR (ky dang)) van hoa. hieu va cac dat va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nganh ((ky lang) or (ky dang)) van hoa. hieu va cac dat va hanh dai cua tre*.