Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thien van » thi van
toc sach » hoc sach, doc sach, thuoc sach
hang hai » hoang hai, hang tai, thanh hai
hai cua » thai cua, dai cua, hoi cua
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
luc va » duc va, tuc va
loc va » hoc va
v nang » va nang, vu nang, van nang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) v nang ma hoa. thien van thanh ((luc va) OR (loc va)) hang hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) v nang ma hoa. thien van thanh ((luc va) OR (loc va)) hang hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) v nang ma hoa. thien van thanh ((luc va) OR (loc va)) hang hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) v nang ma hoa. thien van thanh ((luc va) OR (loc va)) hang hai cua tre*.