Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa doi, hoc hoi
vai cua » dai cua, hai cua, lai cua
cuc ban » cua ban, cac ban, cuu ban
tu san » thu san, tu ban, tu can
va cao » va cac, va co, va dao
san ky » sang ky, van ky, dan ky
va cam » va cham, va cac, va cai

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 cam) OR (va cao)) cuc ban hanh vai 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 cam) OR (va cao)) cuc ban hanh vai 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 cam) OR (va cao)) cuc ban hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ky lang ((hoa hoi) or (hoa hoc)). lieu ((va cam) OR (va cao)) cuc ban hanh vai cua tre*.