Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cua viet » ca viet, hoa viet, cua vat
thanh di » thanh doi, thanh de, thanh do
cam truc » nam truc, lam truoc, nam truoc
hieu ve » hieu va, hieu van
su sach » so sach, vu sach
nang xa » lang xa, nang ma, mang xa
sach v » sach va, sach y, sach 2
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach v ((nang xa) or (nang x)) hoi. hieu ve ((cam truc) or (cau truc)) van thanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang xa) OR (nang x)) hoi. hieu ve ((cam truc) OR (cau truc)) van thanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang xa) or (nang x)) hoi. hieu ve ((cam truc) or (cau truc)) van thanh di cua viet*.