Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
nhanh hai » nhanh thai, thanh hai, nhanh ha
va nhanh » va thanh, va hanh, va nhan
kho tang » cao tang
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
cac duc » cac du, cao duc, cac dac
hieu ve » hieu van
van hoc » van hoa
ky tang » ky nang, ky dang, ky trong
cua tre » cua te, cuu tre, cua triet

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

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