Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu va » lieu va, hieu qua
cam thu » nam thu, cac thu, ca thu
thu ban » thu hang
va chua » vua chua, ca chua, va chu
so sac » so sach, so dac
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
va cua » via cua, ca cua, ma cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sac ky nang x ho. hieu va cam thu ban thanh ((va cua) or (va chua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sac ky nang x ho. hieu va cam thu ban thanh ((va cua) OR (va chua)) tre.
• Adding a wildcard symbol may retrieve word variants: so sac ky nang x ho. hieu va cam thu ban thanh ((va cua) or (va chua)) tre*.