Perhaps you should try some spelling variations:
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
khanh hoa » thanh hoa, hang hoa
thanh van » thanh toan, thanh phan, thanh nhan
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
cac hoc » cach hoc, cac hop, bac hoc
su cac » tu cac, su cao, su can
hoa vo » hoa co

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

• Performing a fuzzy search may retrieve terms with similar spellings: su cac hoc tap, nghien cuu tong hoc khanh hoa hoc ma hoa vo ((thanh van) OR (thanh san))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su cac hoc tap, nghien cuu tong hoc khanh hoa hoc ma hoa vo ((thanh van) OR (thanh san))".
• Adding a wildcard symbol may retrieve word variants: su cac hoc tap, nghien cuu tong hoc khanh hoa hoc ma hoa vo ((thanh van) OR (thanh san))*.