Perhaps you should try some spelling variations:
nghien huu » nghien cuu, nguyen huu, nhiem huu
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
thai benh » tai benh, thai binh, tri benh
phoi tai » hoi tai, phi tai, pham tai
nhan dan » phan dau, gian dan, nhan tai
su cach » su sach, tu cach, cuu cach
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
xa thai » ca thai, a thai, da thai
su cac » tu cac, su cao, su can
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cach) or (su cac)) phoi tai, nghien huu mot hoc khanh hoa hoc xa thai benh nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cach) OR (su cac)) phoi tai, nghien huu mot hoc khanh hoa hoc xa thai benh nhan dan.
• Adding a wildcard symbol may retrieve word variants: ((su cach) or (su cac)) phoi tai, nghien huu mot hoc khanh hoa hoc xa thai benh nhan dan*.