Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
hoc sach » hoc sinh, hoc cac, hoc anh
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
dat cua » dai cua, day cua, mat cua
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
cac tu » cac thu, cach tu, cac du
ma hoi » xa hoi, ma hoa, me hoi

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: hoc sach y nang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu van)) cac tu va thanh dat cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu van)) cac tu va thanh dat cua tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach y nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu van)) cac tu va thanh dat cua tre*.