Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thien van » thi van
van thanh » van tuan
su sach » so sach, vu sach
tai duc » tai cuc, mai duc, tai du
van cau » van dau, van hau, van chat
cau duc » cao duc, cau luc, chu duc
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
duc tu » luc tu

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 duc ((van thanh) OR (ban thanh)) tai duc tu~.
• 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 duc ((van thanh) OR (ban thanh)) tai duc tu.
• 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 duc ((van thanh) OR (ban thanh)) tai duc tu".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang xa) or (lang xa)) hoi. thien van cau duc ((van thanh) OR (ban thanh)) tai duc tu*.