Perhaps you should try some spelling variations:
hac thuc » hoc thuc, ha thuc, thach thuc
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, vu khach
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van hac » van hoc, van ha, van hai
cua tre » cua te, cuu tre, cua triet
lang ha » long ha
lang xa » dang xay, lang van
su sach » so sach
di cua » dai cua, doi cua, de cua

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

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