Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thanh tai » thanh hai, thanh toan, doanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
van cau » van hau, van chat, toan cau
van dau » van dao, phan dau
duc van » duc va, duc tan, duc manh
cuc du » cac du

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 ky ((nang xa) or (lang xa)) hoi. thien ((van cau) OR (van dau)) duc van thanh tai cuc du~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang xa) OR (lang xa)) hoi. thien ((van cau) OR (van dau)) duc van thanh tai cuc du.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang xa) or (lang xa)) hoi. thien ((van cau) OR (van dau)) duc van thanh tai cuc du".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. thien ((van cau) OR (van dau)) duc van thanh tai cuc du*.