Perhaps you should try some spelling variations:
kinh kien » kinh dien, linh kien, dinh kien
toc sach » hoc sach, doc sach, thuoc sach
kien cau » khien cau, hien cau, thien cau
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
thuc va » thuc vat, thuc dan, thuc day
nang xa » lang xa, nang ma, mang xa
va cam » va cham, va cac, va cao
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: toc sach ky ((nang xa) OR (nang x)) hoi. hieu va cam ((tuc va) OR (thuc va)) kinh kien cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang xa) OR (nang x)) hoi. hieu va cam ((tuc va) or (thuc va)) kinh kien cau tren~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) OR (nang x)) hoi. hieu va cam ((tuc va) or (thuc va)) kinh kien cau tren*.