Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
su sach » so sach, vu sach
cao xuc » cam xuc, cao duc, cao suc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
mang xa » lang xa, mang may, dang xay
xuc va » duc va, tuc va, luc va
va cao » va cac, va co, va dao

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