Perhaps you should try some spelling variations:
lam thuc » lam thuoc, am thuc, nam thuc
va thanh » gia thanh, ban thanh, va tinh
tu sach » thu sach, su sach, te sach
cua tre » cuu tre, cua triet, dua tren
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va danh, ban hanh
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
va lam » van lam, va lap
cua te » cua tu

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