Perhaps you should try some spelling variations:
nhanh doc » nhanh soc, nhanh dong, nang doc
lang van » dang van, tang van, hoang van
va nhanh » va thanh, va nhan, va nganh
lang ha » long ha
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
doc va » duoc va, hoc va, duc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky ((lang ha) or (lang van)) hoi. hieu va nhanh doc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((lang ha) OR (lang van)) hoi. hieu va nhanh doc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((lang ha) or (lang van)) hoi. hieu va nhanh doc va hanh vi cua tre*.