Perhaps you should try some spelling variations:
hanh sinh » hanh tinh, hanh dinh, hinh sinh
hieu van » hieu va, thien van, lieu va
sinh cua » manh cua, dinh cuu, sinh va
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cao duc » dao duc, cao suc, tao duoc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) OR (sach y)) nang xa hoi. hieu van ((cao duc) or (giao duc)) va hanh sinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach y)) nang xa hoi. hieu van ((cao duc) OR (giao duc)) va hanh sinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sach y)) nang xa hoi. hieu van ((cao duc) or (giao duc)) va hanh sinh cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sach y)) nang xa hoi. hieu van ((cao duc) or (giao duc)) va hanh sinh cua tre*.