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
sach ky » sac ky, sach y, sach ty
van ham » van tham, van pham, van nam
ham cua » pham cua, hai cua, nam cua
benh da » benh va, benh do, benh ma
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu van ham cua ban ((benh da) or (benh dai)) ((cua su) OR (qua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ky nang x hoi. hieu van ham cua ban ((benh da) OR (benh dai)) ((cua su) OR (qua su))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ky nang x hoi. hieu van ham cua ban ((benh da) or (benh dai)) ((cua su) OR (qua su))*".