Perhaps you should try some spelling variations:
thanh do » thanh de, thanh pho, thanh hoa
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
mai hoi » mai khoi, dai hoi, lai hoi
thuc va » thuc vat, thuc dan, thuc day
do cua » doi cua, co cua, de cua
tu cao » cu cao, tu cac, vu cao
ma hoi » xa hoi, ma hoa, me hoi
le nam » ly nam, he nam, te nam
le na » le va, le ta, le ha

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 cao ky nang ((ma hoi) OR (mai hoi)). hieu ((le nam) OR (le na)) thuc va thanh do cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cao ky nang ((ma hoi) or (mai hoi)). hieu ((le nam) OR (le na)) thuc va thanh do cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cao ky nang ((ma hoi) or (mai hoi)). hieu ((le nam) OR (le na)) thuc va thanh do cua tre*.