Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
hanh hai » thanh hai, nhanh hai, hang hai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cao duc » dao duc, cao suc, tao duoc
cua tre » cua te, cuu tre, dua tren

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