Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
dao duc » giao duc, tao duoc
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
vang xa » mang xa, ang xa, dang xay
lang xa » lang ha, dang xay, lang van
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: tu sach y ((vang xa) OR (lang xa)) hoi. hieu van ((pham duc) or (dao duc)) van thanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((vang xa) OR (lang xa)) hoi. hieu van ((pham duc) OR (dao duc)) van thanh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((vang xa) OR (lang xa)) hoi. hieu van ((pham duc) or (dao duc)) van thanh vai cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y ((vang xa) OR (lang xa)) hoi. hieu van ((pham duc) or (dao duc)) van thanh vai cua te*.