Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hanh hoi » hanh thoi, hanh noi, hanh hoa
hoi cua » hoi chuc
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va
van hoc » van hoa
ky dang » ky nang, ky danh
ky lang » ky nang, ky tang, tay lang
dac va » duc va, day va, dat va

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