Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach ty
van lam » van nam
cuc ban » cac ban, cuu ban, duc ban
nang xa » nang x, lang xa, mang xa
benh di » benh dai, ben di, benh da
cuu tre » cua tre, cau tren, cau treo
di cuu » di cau, di cua, dinh cuu

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

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