Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
chua tre » chua tri, cua tre, chua trieu
thanh va » hanh va, thanh ha, thanh ve
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
ma hoi » mai hoi, ma hoa, me hoi
ve am » va am

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang ((ma hoi) OR (xa hoi)). hieu ve am thuc va ((thanh va) OR (thanh van)) chua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang ((ma hoi) or (xa hoi)). hieu ve am thuc va ((thanh va) OR (thanh van)) chua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ((ma hoi) or (xa hoi)). hieu ve am thuc va ((thanh va) OR (thanh van)) chua tre*.