Perhaps you should try some spelling variations:
giai thanh » gian thanh, giay thanh, giao thanh
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac thu » cach thuc, cac thoi
cua tre » cua te, cuu tre, cua triet
su viet » so viet
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu va cac thu ((giai thanh) OR (gia thanh)) ve ((cua tre) or (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang xa hoi. hieu va cac thu ((giai thanh) OR (gia thanh)) ve ((cua tre) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang xa hoi. hieu va cac thu ((giai thanh) OR (gia thanh)) ve ((cua tre) or (su viet))".
• Adding a wildcard symbol may retrieve word variants: so sach y nang xa hoi. hieu va cac thu ((giai thanh) OR (gia thanh)) ve ((cua tre) or (su viet))*.