Perhaps you should try some spelling variations:
hoc hanh » hoc nhanh, hoc thanh, hoc anh
va thanh » gia thanh, ban thanh, va tinh
cac duc » cac du, cao duc, cac dac
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va danh, ban hanh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
ve cac » va cac, vien cac

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

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