Perhaps you should try some spelling variations:
sanh hoc » anh hoc, danh hoc, thanh hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoc » tuong hoc, thong hoc, trong hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
dan hoa » danh hoa, dan hoat, dan khoa
hoa van » hoa dan, hoang van, hoa phan

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

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