Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nang van » dang van, lang van, nong van
tang van » dang van, hoang van, trong van
hanh hai » thanh hai, nhanh hai, hang hai
nganh ky » nganh y, nganh xay, hanh ky
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va dao » ca dao
ve cao » va cao, ve bao, ve 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 ((nang van) OR (tang van)) hoi. hieu ((ve cao) or (va dao)) duc va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh ky ((nang van) OR (tang van)) hoi. hieu ((ve cao) OR (va dao)) duc va hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh ky ((nang van) OR (tang van)) hoi. hieu ((ve cao) or (va dao)) duc va hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc nganh ky ((nang van) OR (tang van)) hoi. hieu ((ve cao) or (va dao)) duc va hanh hai cua tre*.