Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
lang van » dang van, hoang van, giang van
tang van » dang van, hoang van, trong van
nganh ky » nganh y, nganh xay, hanh ky
va hanh » van hanh, va thanh, ban hanh
hai cua » thai cua, dai cua, hoi cua
va danh » va dinh, va dan, dia danh
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
cua tre » cua te, cuu tre, cua triet

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 va cac duc ((va hanh) or (va danh)) hai 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 va cac duc ((va hanh) OR (va danh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ky ((lang van) OR (tang van)) hoi. hieu va cac duc ((va hanh) or (va danh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((lang van) OR (tang van)) hoi. hieu va cac duc ((va hanh) or (va danh)) hai cua tre*.