Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lam thuoc » nam thuoc, am thuc, cay thuoc
thuoc va » thuc va, thuoc ma, thuong va
cua tre » cua te, cuu tre, dua tren
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang

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 hoi. ((hieu va) OR (hieu qua)) lam thuoc va hanh di ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky lang xa hoi. ((hieu va) OR (hieu qua)) lam thuoc va hanh di ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky lang xa hoi. ((hieu va) OR (hieu qua)) lam thuoc va hanh di ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky lang xa hoi. ((hieu va) OR (hieu qua)) lam thuoc va hanh di ((cua tre) or (cua triet))*.