Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cham truc » cau truc, nham thuc, pham thuc
hieu van » hieu va, thien van, lieu va
danh dau » lanh dao, hang dau, danh tu
van cham » van chat, van tham, va cham
dang xay » dang van, van xay
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, lang van
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach ty ((lang xa) or (dang xay)) hoi. hieu van cham truc va danh dau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ty ((lang xa) OR (dang xay)) hoi. hieu van cham truc va danh dau cua tre.
• Adding a wildcard symbol may retrieve word variants: thuoc sach ty ((lang xa) or (dang xay)) hoi. hieu van cham truc va danh dau cua tre*.