Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
trung va » truong va, trang va, trung ha
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
cua tu » cua tuc, cua su, cua cu
x hoi » xa hoi, o hoi, x ho

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 y nang x hoi. hieu van nam ((luc va) or (trung va)) hanh hai ((cua tre) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang x hoi. hieu van nam ((luc va) OR (trung va)) hanh hai ((cua tre) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. hieu van nam ((luc va) or (trung va)) hanh hai ((cua tre) or (cua tu))*.