Perhaps you should try some spelling variations:
hoc nhanh » hoc nganh, hoc phan
hoang van » hang va
thanh hai » thanh phan, thanh hoa, thanh san
nhanh ky » hanh ky, nhan ky, nganh ky
tang van » dang van, trong van, tang luan
va thanh » gia thanh, ban thanh, va tinh
hieu ve » hieu va, hieu van
cac dac » cac dan, cac dai, cac bac
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
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 nhanh ky ((tang van) or (hoang van)) hoi. hieu ve cac dac va thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nhanh ky ((tang van) OR (hoang van)) hoi. hieu ve cac dac va thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nhanh ky ((tang van) or (hoang van)) hoi. hieu ve cac dac va thanh hai cua tre*.