Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh dai » danh dau, danh di, danh sai
van chat » cao chat
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach ty
truc va » thuc va, trung va
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, 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: thu sach ly nang ((ma hoi) OR (ma hoa)). hieu van chat ((truc va) OR (thuc vat)) danh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ly nang ((ma hoi) or (ma hoa)). hieu van chat ((truc va) OR (thuc vat)) danh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: thu sach ly nang ((ma hoi) or (ma hoa)). hieu van chat ((truc va) OR (thuc vat)) danh dai cua tre*.