Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
nang xa » lang xa, nang ma, mang xa
lam luc » lao luc, lam duoc
va kinh » va tinh, qua kinh
kinh di » kinh do, kinh i, minh di
luc va » duc va, tuc va, loc va
di cau » da cau, diem cau

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 (nang x)) hoi. ((hieu van) or (thien van)) lam luc va kinh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky ((nang xa) OR (nang x)) hoi. ((hieu van) OR (thien van)) lam luc va kinh di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky ((nang xa) OR (nang x)) hoi. ((hieu van) or (thien van)) lam luc va kinh di cau tren".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ky ((nang xa) OR (nang x)) hoi. ((hieu van) or (thien van)) lam luc va kinh di cau tren*.