Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cac thuc » cach thuc, cac thu, cay thuc
can thuc » dan thuc, van thuc, cay thuc
vat hanh » vat thanh, van hanh, va hanh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh ve » hanh vi, hanh va, hanh kem
cuu tre » cua tre, cau tren, cau treo
cua te » cua tu

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

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