Perhaps you should try some spelling variations:
thuoc sac » thuoc sach, thuoc dac, thuoc sai
hieu van » hieu va, thien van, lieu va
cau nuoc » cap nuoc, cac nuoc, dau nuoc
nuoc ban » nuoc san, quoc ban, buoc ban
ban hanh » ban hang
su triet » su viet, su tien
ve triet » va trien
lang xa » lang ha, dang xay, lang van
van cau » van dau, van hau, van chat
sac ky » cac ky, sai ky

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: thuoc sac ky ((nang x) OR (lang xa)) hoi. hieu van cau nuoc ban hanh vi ((su triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sac ky ((nang x) or (lang xa)) hoi. hieu van cau nuoc ban hanh vi ((su triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: thuoc sac ky ((nang x) or (lang xa)) hoi. hieu van cau nuoc ban hanh vi ((su triet) OR (ve triet))*.