Perhaps you should try some spelling variations:
hoang dai » hoang hai, hoang mai, hoang da
ban hoang » ban hang, van hoang, quan hoang
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
hieu va » lieu va, hieu qua
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
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 ((ty nang) or (ky nang)) xa hoi. hieu va cac duc ban hoang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. hieu va cac duc ban hoang dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ky nang)) xa hoi. hieu va cac duc ban hoang dai cua tre*.