Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
hieu viec » nhieu viec, hieu ve, sieu viet
danh thai » anh thai, dang thai, dinh thai
thai cua » than cua, tai cuc, tri cua
nhanh ky » hanh ky, nhan ky, nganh ky
van hoi » van hoc, van hoe, van loi
cac duc » cac du, cac dac, cac nuoc
cao duc » dao duc, cao suc, giao duc
va danh » va dinh, va dan, va hanh
ky lang » ky nang, ky dang, ky tang
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 nhanh ky lang ((van hoi) or (van hoa)). hieu viec ((cac duc) OR (cao duc)) va danh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhanh ky lang ((van hoi) OR (van hoa)). hieu viec ((cac duc) OR (cao duc)) va danh thai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nhanh ky lang ((van hoi) or (van hoa)). hieu viec ((cac duc) OR (cao duc)) va danh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nhanh ky lang ((van hoi) or (van hoa)). hieu viec ((cac duc) OR (cao duc)) va danh thai cua tre*.