Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
hieu van » hieu va, thien van, lieu va
van nhan » van phan, van thanh, danh nhan
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tai cua » thai cua, tai cuc, tri cua
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
co hoi » co hoc, co loi
cua te » cua tu
o hoi » o hoc, o hai, o hoa

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 v nang ((o hoi) OR (co hoi)). hieu van nhan thuc va hanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((o hoi) OR (co hoi)). hieu van nhan thuc va hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((o hoi) OR (co hoi)). hieu van nhan thuc va hanh tai cua te*.