Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam truc » nam truoc, nam thuc, nam trung
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
danh vi » dinh vi, danh di, danh va
y nang » ky nang, ly nang, v nang
cua su » qua su
x hoi » xa hoi, x ho, 5 hoi
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: tu sach y nang ((x hoi) or (o hoi)). hieu van nam truc va ((danh vi) or (hanh vi)) cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((x hoi) OR (o hoi)). hieu van nam truc va ((danh vi) OR (hanh vi)) cua su.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((x hoi) or (o hoi)). hieu van nam truc va ((danh vi) or (hanh vi)) cua su*.