Perhaps you should try some spelling variations:
nang khoa » hang khoa, dang khoa, nang hoa
thanh van » thanh san, thanh toan, thanh phan
khoa hoi » khoan hoi, khoa hoc, khoa doi
va triet » va trien, ve triet, cua triet
hieu va » lieu va, hieu qua
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang khoa hoi. hieu va cam ((xuc va) or (tuc xa)) thanh van ((va triet) OR (va thiet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang khoa hoi. hieu va cam ((xuc va) OR (tuc xa)) thanh van ((va triet) OR (va thiet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang khoa hoi. hieu va cam ((xuc va) or (tuc xa)) thanh van ((va triet) OR (va thiet))*".