Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
tai duc » tai cuc, mai duc, tai du
duc van » duc va, duc tan, duc manh
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
duc tu » luc tu

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

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