Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoa » doanh khoa, doanh hoan, danh hoa
dich hoc » sinh hoc, hinh hoc, tinh hoc
hoa benh » khoa benh, hoa binh, hoc benh
nhan tai » hang tai, van tai, toan tai
ve dich » va dich, van dich
mot hoc » mon hoc, mo hoc, mot goc

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve dich hoc tap, nghien cua mot hoc doanh hoa hoc ma ((hoa benh) or (kham benh)) nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve dich hoc tap, nghien cua mot hoc doanh hoa hoc ma ((hoa benh) OR (kham benh)) nhan tai.
• Adding a wildcard symbol may retrieve word variants: ve dich hoc tap, nghien cua mot hoc doanh hoa hoc ma ((hoa benh) or (kham benh)) nhan tai*.