Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hanh dien » nhanh dien, hang dien, danh dien
dien cuu » dien cuc, dien cu, dien cua
hieu van » hieu va, thien van, lieu va
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan, thuc day
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cuu tre » cua tre, cau tren, cau treo

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