Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
thuc day » thuc dan, thuc vat
hieu van » hieu va, thien van, lieu va
su sach » so sach
hai cua » thai cua, dai cua, hoi cua
truc va » thuc va, thuc vat, trung va
van dau » van dao, phan dau
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
cua tre » cua te, cuu tre, cua triet

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang xa hoi. hieu van dau ((truc va) OR (thuc day)) hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) ty nang xa hoi. hieu van dau ((truc va) or (thuc day)) hanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sach) OR (vu sach)) ty nang xa hoi. hieu van dau ((truc va) or (thuc day)) hanh hai cua tre*.