Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cau thuc » cau truc, cuu thuc, can thuc
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hanh de » hanh ve, hanh kem
cua tre » cuu tre, cua triet, dua tren
va cau » van cau, va cac, va dau
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 cau thuc van hanh de ((cua 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 cau thuc van hanh de ((cua tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky nang xa hoi. lieu va cau thuc van hanh de ((cua tre) or (cua te))*.