Perhaps you should try some spelling variations:
hoa doanh » hoa dan
sach thu » sach thue, sach thieu, sach tham
cuu cong » cua cong, thu cong, cac cong
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
te sach » toc sach
thu tap » thu thap, thuc tap, thu tai
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau
toan » tran

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