Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
thanh hai » thanh phan, thanh hoa, thanh san
tang van » hoang van, trong van, tang luan
dang van » hoang van, hang va
hanh hai » nhanh hai, hang hai, hanh tai
nganh ky » nganh y, nganh xay, hanh ky
cua tre » cua te, cuu tre, cua triet
cac dac » cac dan, cac dai, cac bac
hieu ve » hieu va, hieu van
dac va » duc va, day va, dat va
ve cac » va cac, vien cac

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