Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
su triet » su viet, ve triet
te sach » toc sach
thu van » thuc van, thuy van, tu van
su tien » su kien, su hien, tu tieng
hieu le » hieu ve, hieu he, hieu ly
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dang » ky nang, ky danh
ky hang » ky nang, ly hang, ty hang
le nam » ly nam, he nam, le na

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 hang) OR (ky dang)) hoa hoi. hieu le nam thu van thanh tai ((su triet) or (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky hang) OR (ky dang)) hoa hoi. hieu le nam thu van thanh tai ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky hang) OR (ky dang)) hoa hoi. hieu le nam thu van thanh tai ((su triet) or (su tien))".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky hang) OR (ky dang)) hoa hoi. hieu le nam thu van thanh tai ((su triet) or (su tien))*.