Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hanh hai » thanh hai, nhanh hai, hang hai
sang tao » hang tai
hieu van » hieu va, thien van, lieu va
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa

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 ((nang ma) or (sang tao)) hoi. hieu van thanh ((luc va) OR (tuc va)) hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach v ((nang ma) OR (sang tao)) hoi. hieu van thanh ((luc va) OR (tuc va)) hanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach v ((nang ma) or (sang tao)) hoi. hieu van thanh ((luc va) OR (tuc va)) hanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach v ((nang ma) or (sang tao)) hoi. hieu van thanh ((luc va) OR (tuc va)) hanh hai cua tre*.