Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
hoa hoi » khoa hoi, hoa hoc, hoc hoi
hoa doi » hoa dai, hoc doi, xoa doi
hieu ve » hieu va, hieu van
thu van » thuc van, thuy van, tu van
su viet » so viet
ve nam » he nam, va nam, le nam
tai su » tai so, tai tu, lai 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 ((hoa hoi) OR (hoa doi)). hieu ve nam thu van thanh tai su viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((hoa hoi) OR (hoa doi)). hieu ve nam thu van thanh tai su viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((hoa hoi) OR (hoa doi)). hieu ve nam thu van thanh tai su viet*.