Perhaps you should try some spelling variations:
cac thuc » cach thuc, cac thu, can thuc
va danh » va dinh, va hanh, dia danh
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
du cua » duy cua, dau cua, dum cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y ((mang xa) or (nang ma)) hoi. lieu va cac thuc ((va danh) OR (va dan)) du cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y ((mang xa) OR (nang ma)) hoi. lieu va cac thuc ((va danh) OR (va dan)) du cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y ((mang xa) or (nang ma)) hoi. lieu va cac thuc ((va danh) OR (va dan)) du cua tre".
• Adding a wildcard symbol may retrieve word variants: so sach y ((mang xa) or (nang ma)) hoi. lieu va cac thuc ((va danh) OR (va dan)) du cua tre*.