Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
benh dai » benh tai, benh noi, binh dan
hieu van » hieu va, thien van, lieu va
xuc ban » duc ban, cuc ban, quoc ban
benh di » ben di, benh da, benh do
nam xuc » cam xuc, nam xua, nam thuc
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
cuu tre » cua tre, cau tren, cau treo

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky ((nang ma) or (nang x)) hoi. hieu van nam xuc ban ((benh di) OR (benh dai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((nang ma) OR (nang x)) hoi. hieu van nam xuc ban ((benh di) OR (benh dai)) cuu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) or (nang x)) hoi. hieu van nam xuc ban ((benh di) OR (benh dai)) cuu tre*".