Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
benh than » benh nhan, benh phan, benh tan
tay thai » lay thai, toc thai, ca thai
than cua » nhan cua, thai cua, ban cua
ban benh » san benh, ba benh, ban banh
sach ky » sac ky, sach y, sach ty
hieu vi » hieu voi, hieu va, hieu ve
duc ban » duc tan, duc van, dua ban
sai ky » sac ky
pham » phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ky) or (sai ky)) danh ((tay thai) OR (y thai)). hieu vi pham duc ban benh than cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ky) OR (sai ky)) danh ((tay thai) OR (y thai)). hieu vi pham duc ban benh than cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ky) or (sai ky)) danh ((tay thai) OR (y thai)). hieu vi pham duc ban benh than cua triet".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ky) or (sai ky)) danh ((tay thai) OR (y thai)). hieu vi pham duc ban benh than cua triet*.