Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van doanh » toan doanh, van dong, van anh
toc sach » hoc sach, doc sach, thuoc sach
cac truc » cau truc, cac tru, cac trung
cua cua » cua chua, ca cua, qua cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach 2
me hoi » le hoi
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 v nang ((me hoi) or (ma hoa)). hieu va cac truc ((van doanh) OR (van thanh)) cua cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach v nang ((me hoi) OR (ma hoa)). hieu va cac truc ((van doanh) OR (van thanh)) cua cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach v nang ((me hoi) or (ma hoa)). hieu va cac truc ((van doanh) OR (van thanh)) cua cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach v nang ((me hoi) or (ma hoa)). hieu va cac truc ((van doanh) OR (van thanh)) cua cua tre*.