Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
thuc dan » thuc hanh, hoc dan, thuc vat
te sach » toc sach
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc day
cuu tre » cua tre, cau tren, cau treo
vi cuu » vi luu, vinh cuu
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang x hoi. ((hieu van) OR (thien van)) nam ((thuc va) OR (thuc dan)) hanh vi cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang x hoi. ((hieu van) or (thien van)) nam ((thuc va) OR (thuc dan)) hanh vi cuu tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang x hoi. ((hieu van) or (thien van)) nam ((thuc va) OR (thuc dan)) hanh vi cuu tre*.