Perhaps you should try some spelling variations:
nhan thuc » nhan luc, dan thuc, toan thuc
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
van nhan » van phan, van thanh, danh nhan
tai cua » thai cua, tai cuc, tri cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
sach v » sach va, sach y, sach vay
nang o » nang co, nang ho, nang ro
sach 2 » sach y
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 v) OR (sach 2)) nang o 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) OR (sach 2)) nang o hoi. hieu van nhan thuc va hanh tai cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach v) OR (sach 2)) nang o hoi. hieu van nhan thuc va hanh tai cua te*.