Perhaps you should try some spelling variations:
van danh » van doanh, van anh, van hanh
vat danh » va danh, luat danh, nhat danh
cau thuc » cau truc, cuu thuc, can thuc
sach ty » sach y, sach thu, xach tay
hieu ke » hieu kem, chieu ke, hieu ky
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
ke cau » ket cau
va cua » va chua, via cua, ca 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 ty) or (sach tu)) nang xa hoi. hieu ke cau thuc ((vat danh) OR (van danh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) nang xa hoi. hieu ke cau thuc ((vat danh) OR (van danh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach tu)) nang xa hoi. hieu ke cau thuc ((vat danh) OR (van danh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach tu)) nang xa hoi. hieu ke cau thuc ((vat danh) OR (van danh)) va cua tre*.