Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
tam dich » tap dich, tham dinh, nam dinh
dich hoc » sinh hoc, hinh hoc, tinh hoc
cong hoc » dong hoc, cong hoa, cong coc
nhan tai » hang tai, van tai, toan tai
hoi cac » hoc cac, voi cac, hoa cac
hoc xa » hoc ma
hoi ca » hoi cua, hoi cau, hoi va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tam dich hoc tap, nghien cua cong hoc khanh hoa hoc xa ((hoi ca) OR (hoi cac)) nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tam dich hoc tap, nghien cua cong hoc khanh hoa hoc xa ((hoi ca) OR (hoi cac)) nhan tai".
• Adding a wildcard symbol may retrieve word variants: tam dich hoc tap, nghien cua cong hoc khanh hoa hoc xa ((hoi ca) OR (hoi cac)) nhan tai*.