Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
hanh thai » nhanh thai, hinh thai, hanh tai
nganh ky » nganh y, nganh xay, hanh ky
thai cua » than cua, tai cuc, tri cua
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
dac va » duc va, dat va, dai 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 ((lang van) or (tang van)) hoi. hieu ve cac ((dac va) or (day va)) hanh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky ((lang van) OR (tang van)) hoi. hieu ve cac ((dac va) OR (day va)) hanh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((lang van) or (tang van)) hoi. hieu ve cac ((dac va) or (day va)) hanh thai cua tre*.