Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
truc va » thuc va, thuc vat, trung va
danh va » doanh va, hanh va, anh va
y nang » ky nang, ly nang, v nang
cua su » qua su
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: thu sach y nang ((x ho) or (o hoi)). hieu van nam truc va ((danh va) or (hanh vi)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ((x ho) OR (o hoi)). hieu van nam truc va ((danh va) OR (hanh vi)) cua su.
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ((x ho) or (o hoi)). hieu van nam truc va ((danh va) or (hanh vi)) cua su*.