Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
hang hai » hoang hai, hang tai, thanh hai
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach 2, sach vay
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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: tu ((sach v) OR (sach y)) nang x hoi. hieu van thanh ((luc va) or (tuc va)) hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach y)) nang x hoi. hieu van thanh ((luc va) OR (tuc va)) hang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) OR (sach y)) nang x hoi. hieu van thanh ((luc va) or (tuc va)) hang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) OR (sach y)) nang x hoi. hieu van thanh ((luc va) or (tuc va)) hang hai cua tre*.