Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
hieu cua » hieu qua, dieu cua, bieu cua
thuoc va » thuc va, thuoc ma, thuong va
thanh vi » thanh va, thanh ve, nhanh vi
tu sach » thu sach, su sach, te sach
sach ly » sach y, sach lo, sach ty
ly tang » le tang, ly hang, ly vang
tang ma » mang may, tang van
cua nam » cua tam, cua ngan, cua nhan
cuu tre » cua tre, cau tren, cau treo
ma hoi » mai hoi, xa hoi, ma hoa

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 ly tang ma hoi. hieu cua nam thuoc va ((thanh vi) or (hanh vi)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ly tang ma hoi. hieu cua nam thuoc va ((thanh vi) OR (hanh vi)) cuu tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ly tang ma hoi. hieu cua nam thuoc va ((thanh vi) or (hanh vi)) cuu tre*.