Perhaps you should try some spelling variations:
nang cay » nang cao, nang cap, nang cai
cay phoi » cap phoi, tay hoi, cay cho
tinh bai » tinh bac, tinh hai, hinh bai
bo sach » co sach, hoc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
va tinh » may tinh
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
co tuc » co thuc, co toc, do tuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: bo sach ky nang cay phoi. hieu ve ((co tuc) OR (co tu)) va tinh bai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: bo sach ky nang cay phoi. hieu ve ((co tuc) OR (co tu)) va tinh bai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "bo sach ky nang cay phoi. hieu ve ((co tuc) OR (co tu)) va tinh bai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: bo sach ky nang cay phoi. hieu ve ((co tuc) OR (co tu)) va tinh bai ((cua tre) or (cuu tre))*.