Perhaps you should try some spelling variations:
thien van » thi van
cham truc » cau truc, nham thuc, pham thuc
toc sach » hoc sach, doc sach, thuoc sach
dinh dau » dinh dat, dinh du, danh dau
thi hanh » thi thanh
dau cua » dai cua, day cua, cau cua
va dinh » van dinh, va kinh, va tinh
truc va » thuc va, thuc vat, trung va
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa

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. ((thien van) OR (thi hanh)) cham truc va dinh dau cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky ((nang xa) OR (nang x)) hoi. ((thien van) or (thi hanh)) cham truc va dinh dau cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) OR (nang x)) hoi. ((thien van) or (thi hanh)) cham truc va dinh dau cua tre*.