Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
hanh thai » nhanh thai, hinh thai, hanh tai
hieu viec » nhieu viec, sieu viet, hieu hien
thai cua » than cua, tai cuc, tri cua
nhanh ky » hanh ky, nhan ky, nganh ky
cac duc » cac du, cao duc, cac dac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
van hoi » van hoc, van hoe, van loi
ky lang » ky nang, ky dang, ky tang

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) OR (hieu ve)) cac duc va hanh 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) OR (hieu ve)) cac duc va hanh 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) OR (hieu ve)) cac duc va hanh thai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nhanh ky lang ((van hoi) or (van hoa)). ((hieu viec) OR (hieu ve)) cac duc va hanh thai cua tre*.