Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuc » nam thuoc, am thuc, nam thu
cau tren » cu tren, dau tren, ca tren
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
sach ky » sac ky, sach y, sach ty
dao van » do van, dang van
cuu tre » cua tre, cau treo
dao dan » cao dang, dao dong
va nam » van nam, ha nam, va nay

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 lang xa hoi. hieu va nam thuc ((dao dan) OR (dao van)) vai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky lang xa hoi. hieu va nam thuc ((dao dan) OR (dao van)) vai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky lang xa hoi. hieu va nam thuc ((dao dan) OR (dao van)) vai ((cuu tre) or (cau tren))*".