Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
nam duoc » nam thuoc, da duoc, dat duoc
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nam duc » pham duc, nam thuc, nam buoc
lang xa » lang ha, dang xay, lang van
su viet » so viet
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky ((lang xa) or (nang x)) hoi. hieu van ((nam duc) OR (nam duoc)) van thanh vi su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (nang x)) hoi. hieu van ((nam duc) OR (nam duoc)) van thanh vi su viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (nang x)) hoi. hieu van ((nam duc) OR (nam duoc)) van thanh vi su viet*".