Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
lam thuoc » am thuc, cay thuoc, nam thuc
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
bai cua » ban cua, dai cua, bai ca
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hai cua » thai cua, dai cua, hoi cua
su bac » xu bac, du bac, su cac
bac ky » cac ky, ban ky, sac ky

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

• If you are trying to use Boolean operators, they must be ALL CAPS: su bac ky tang xa hoi. hieu van ((lam thuoc) OR (nam thuoc)) va thanh ((bai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su bac ky tang xa hoi. hieu van ((lam thuoc) OR (nam thuoc)) va thanh ((bai cua) or (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su bac ky tang xa hoi. hieu van ((lam thuoc) OR (nam thuoc)) va thanh ((bai cua) or (hai cua)) tre*.