Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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: ((toc sach) or (hoc sach)) v nang x ho. hieu va cac ((luc va) or (tuc va)) thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) v nang x ho. hieu va cac ((luc va) OR (tuc va)) thanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (hoc sach)) v nang x ho. hieu va cac ((luc va) or (tuc va)) thanh hai cua tre*.