Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
su sach » so sach, vu sach
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
cao duc » dao duc, cao suc, giao duc
sach ty » sach y, sach tu, sach thu
cac duc » cac du, cac dac, cac nuoc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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