Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
cua tre » cua te, cuu tre, cua triet
sach 2 » sach y
sach v » sach va, sach y, sach vay
xuc va » duc va, tuc va, luc va
loc va » hoc va, luc va
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach v) OR (sach 2)) nang x hoi. hieu van tham ((xuc va) or (loc va)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach v) OR (sach 2)) nang x hoi. hieu van tham ((xuc va) OR (loc va)) hanh dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach v) OR (sach 2)) nang x hoi. hieu van tham ((xuc va) or (loc va)) hanh dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((sach v) OR (sach 2)) nang x hoi. hieu van tham ((xuc va) or (loc va)) hanh dai cua tre*.