Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hieu van » hieu va, thien van, lieu va
nang lai » nang tai, nang cai, nang hai
sinh cua » manh cua, dinh cuu, sinh va
mang lai » mang lam, mang luoi, dang loai
thuoc va » thuc va, thuoc ma, thuong va
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
vi cuu » vi luu, vinh cuu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang lai) OR (mang lai)) hoi. hieu van nam thuoc va hanh ((vi cuu) or (sinh cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang lai) OR (mang lai)) hoi. hieu van nam thuoc va hanh ((vi cuu) OR (sinh cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang lai) OR (mang lai)) hoi. hieu van nam thuoc va hanh ((vi cuu) or (sinh cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang lai) OR (mang lai)) hoi. hieu van nam thuoc va hanh ((vi cuu) or (sinh cua)) tre*.