Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
benh dai » benh tai, benh noi, binh dan
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
van cam » van nam, van lam, van cau
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tuc » cua duc, cua tu, cua thuoc
ben di » ben dai, bien di, den di

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 y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((ben di) or (benh dai)) cua tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((ben di) OR (benh dai)) cua tuc*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y ((nang xa) OR (lang xa)) hoi. hieu van cam duc ban ((ben di) or (benh dai)) cua tuc*".