Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa doi, hoc hoi
cac xuc » cam xuc, cac nuoc, chat xuc
xuc ban » duc ban, cuc ban, quoc ban
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky lang ((hoa hoi) or (hoa hoc)). lieu va cac xuc ban ((hanh vai) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky lang ((hoa hoi) OR (hoa hoc)). lieu va cac xuc ban ((hanh vai) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky lang ((hoa hoi) or (hoa hoc)). lieu va cac xuc ban ((hanh vai) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang ((hoa hoi) or (hoa hoc)). lieu va cac xuc ban ((hanh vai) OR (hanh vi)) cua tre*.