Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
hieu van » thien van, lieu va, hieu ve
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
hai cua » thai cua, dai cua, hoi cua
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va, loc va

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 ty nang xa hoi. ((hieu van) OR (hieu va)) lam ((luc va) OR (truc va)) hanh hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. ((hieu van) OR (hieu va)) lam ((luc va) or (truc va)) hanh hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. ((hieu van) OR (hieu va)) lam ((luc va) or (truc va)) hanh hai cua tre*.