Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
su sach » so sach, vu sach
ly nang » ly hang, ly vang, ly quang
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc
vai cua » dai cua, hai cua, lai cua
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 ((ly nang) or (ky nang)) xa hoi. hieu va ((cac duc) OR (cac du)) ban thanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ly nang) OR (ky nang)) xa hoi. hieu va ((cac duc) OR (cac du)) ban thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ly nang) or (ky nang)) xa hoi. hieu va ((cac duc) OR (cac du)) ban thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ly nang) or (ky nang)) xa hoi. hieu va ((cac duc) OR (cac du)) ban thanh vai cua tre*.