Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
sach vu » sach va, sach tu, sach uu
danh vi » hanh vi, dinh vi, danh di
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
te sach » toc sach
hieu va » lieu va, hieu qua
vu nang » vuc nang, va nang, vu dang
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua
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: te sach vu nang x hoi. ((hieu van) or (hieu va)) chat ((truc va) or (thuc va)) danh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach vu nang x hoi. ((hieu van) OR (hieu va)) chat ((truc va) OR (thuc va)) danh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach vu nang x hoi. ((hieu van) or (hieu va)) chat ((truc va) or (thuc va)) danh vi cua tre*.