Perhaps you should try some spelling variations:
lam thuoc » nam thuoc, am thuc, cay thuoc
lam thuc » am thuc, nam thuc, dam thuc
hanh doi » thanh doi, hanh noi, hang doi
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
cua tre » cua te, cuu tre, cua triet

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 ((lang xa) or (dang xay)) hoi. hieu va ((lam thuc) or (lam thuoc)) va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((lang xa) OR (dang xay)) hoi. hieu va ((lam thuc) OR (lam thuoc)) va hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (dang xay)) hoi. hieu va ((lam thuc) or (lam thuoc)) va hanh doi cua tre*.