Perhaps you should try some spelling variations:
sach tham » sach nha
toc sach » hoc sach, doc sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
nang xa » lang xa, nang ma, mang xa
va kinh » va tinh, qua kinh
kinh di » kinh do, kinh i, minh di
dam tu » nam tu, cam tu, dam thuc
tam tu » nam tu, cam tu, tam thuc
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: toc sach tham ((nang xa) OR (nang x)) hoi. hieu va ((dam tu) or (tam tu)) va kinh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tham ((nang xa) OR (nang x)) hoi. hieu va ((dam tu) OR (tam tu)) va kinh di cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tham ((nang xa) OR (nang x)) hoi. hieu va ((dam tu) or (tam tu)) va kinh di cau tren*".