Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
van quang » van quan, tran quang, van tuan
van nang » van ban, van dong, van dung
hieu van » hieu va, thien van, lieu va
van nham » van nam, van nhan, van tham
hanh dai » hanh tai, hanh dao, vanh dai
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua te » cua tu
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((van nang) OR (van quang)) o hoi. hieu van nham thuc va hanh dai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) OR (van quang)) o hoi. hieu van nham thuc va hanh dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) OR (van quang)) o hoi. hieu van nham thuc va hanh dai cua te*.