Perhaps you should try some spelling variations:
thanh chi » thanh cha, thanh chu, thanh nghi
thien van » thi van
chua tre » chua tri, cua tre, chua trieu
chi chua » chi cua, cha chua, chay chua
hieu van » hieu va, lieu va, hieu ve
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
sach ky » sac ky, sach y, sach ty
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
tuc va » truc va, tuc xa, duc va

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 tang ma hoa. ((hieu van) OR (thien van)) cam ((tuc va) OR (thuc va)) thanh chi chua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ma hoa. ((hieu van) or (thien van)) cam ((tuc va) OR (thuc va)) thanh chi chua tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ma hoa. ((hieu van) or (thien van)) cam ((tuc va) OR (thuc va)) thanh chi chua tre*.