Perhaps you should try some spelling variations:
cam thuc » am thuc, nam thuc, can thuc
tu sach » thu sach, su sach, te sach
danh di » danh du, xanh di, danh dien
va danh » va dinh, va dan, va hanh
cam thu » nam thu, cac thu, ca thu
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
di cua » dai cua, doi cua, de cua

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 ((nang xa) or (tang ma)) hoi. lieu va ((cam thuc) OR (cam thu)) va danh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (tang ma)) hoi. lieu va ((cam thuc) OR (cam thu)) va danh di cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) or (tang ma)) hoi. lieu va ((cam thuc) OR (cam thu)) va danh di cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (tang ma)) hoi. lieu va ((cam thuc) OR (cam thu)) va danh di cua tre*.