Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
toc sach » hoc sach, doc sach, thuoc sach
thanh ve » hanh ve, thanh va, thanh vien
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
cam duc » cam xuc, pham duc, nam duoc
cao duc » dao duc, cao suc, giao duc
y tang » ky tang, 6 tang, 7 tang
ve cua » le cua, de cua, te cua
cua tu » cua tuc, cua su, cua cu

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 y tang xa hoi. hieu ve ((cam duc) or (cao duc)) van thanh ve cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang xa hoi. hieu ve ((cam duc) OR (cao duc)) van thanh ve cua tu.
• Adding a wildcard symbol may retrieve word variants: toc sach y tang xa hoi. hieu ve ((cam duc) or (cao duc)) van thanh ve cua tu*.