Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoa doanh » toan doanh, hoa dan
toc sach » hoc sach, doc sach, thuoc sach
thue tap » thuc tap, thue tai, hue tap
cuu cong » cua cong, thu cong, cac cong
cong hoa » dong hoa, dong hoc, hang hoa
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) thue tap, nghien cuu cong hoa doanh khoa hoc xa hoi ca nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) thue tap, nghien cuu cong hoa doanh khoa hoc xa hoi ca nhan tai".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) thue tap, nghien cuu cong hoa doanh khoa hoc xa hoi ca nhan tai*.