Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
thanh hoi » thanh hoai, thanh hoa, thanh hai
hieu van » thien van, lieu va, hieu ve
va thanh » gia thanh, ban thanh, va tinh
hoi cua » hoi chuc
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
van hoe » van hoa, van hoc, van hieu
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang

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