Perhaps you should try some spelling variations:
nang xay » dang xay, nganh xay, nang xuan
tinh bai » tinh bac, tinh hai, hinh bai
so sach » so sanh, bo sach, co sach
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
co toc » cao toc, co hoc, co doc
co tuc » co thuc, co tu, 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: so sach ky nang xay hoi. hieu ve ((co tuc) OR (co toc)) may tinh bai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang xay hoi. hieu ve ((co tuc) OR (co toc)) may tinh bai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ky nang xay hoi. hieu ve ((co tuc) OR (co toc)) may tinh bai ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: so sach ky nang xay hoi. hieu ve ((co tuc) OR (co toc)) may tinh bai ((cua tre) or (cuu tre))*.