Perhaps you should try some spelling variations:
hanh thai » nhanh thai, hinh thai, anh thai
hieu van » hieu va, thien van, lieu va
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
xang xa » lang xa, mang xa, ang xa
van ha » van hoa, van chat, van hanh
xuc va » duc va, tuc va, luc va
ha xuc » hoa xuc, ha duc, chat xuc

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 y ((xang xa) or (mang may)) hoi. hieu van ha xuc va ((hanh thai) OR (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((xang xa) OR (mang may)) hoi. hieu van ha xuc va ((hanh thai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((xang xa) or (mang may)) hoi. hieu van ha xuc va ((hanh thai) OR (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y ((xang xa) or (mang may)) hoi. hieu van ha xuc va ((hanh thai) OR (hanh tai)) cua tre*.