Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
cac ban » cac dan, cac van, can ban
cam cac » ca cac, nam cac, cam chan
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu van
ty nang » ky nang, ty hang, ly nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ty nang) or (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cam cac ban hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ty nang) OR (ty xang)) xa hoi. ((hieu ve) OR (hieu va)) cam cac ban hanh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) or (ty xang)) xa hoi. ((hieu ve) or (hieu va)) cam cac ban hanh vai cua tre*.