Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh vai » thanh hai, thanh van, thanh tai
nam thuc » nam thuoc, am thuc, nam thu
vu sach » vu bach, su sach, vu khach
vang xa » lang xa, mang xa, ang xa
hieu va » lieu va, hieu qua
dao duc » giao duc, tao duoc
vai cua » dai cua, hai cua, lai cua
y vang » ly vang
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach y vang xa hoi. hieu va ((((nam thuc) or (pham duc))) or (dao duc)) van thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach y vang xa hoi. hieu va ((((nam thuc) OR (pham duc))) OR (dao duc)) van thanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: vu sach y vang xa hoi. hieu va ((((nam thuc) or (pham duc))) or (dao duc)) van thanh vai cua te*.