Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
hieu van » hieu va, thien van, lieu va
nam thuc » am thuc, nam thu, nam tu
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
van anh » van thanh, tuan anh, van minh
anh di » danh di, xanh di, anh d
di cua » dai cua, doi cua, de cua
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky ((mang may) or (lang xa)) hoi. hieu van ((nam thuc) OR (nam thuoc)) van anh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((mang may) OR (lang xa)) hoi. hieu van ((nam thuc) OR (nam thuoc)) van anh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((mang may) or (lang xa)) hoi. hieu van ((nam thuc) OR (nam thuoc)) van anh di cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((mang may) or (lang xa)) hoi. hieu van ((nam thuc) OR (nam thuoc)) van anh di cua te*.