Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh van » thanh san, thanh toan, thanh phan
cho thanh » cho phan, tro thanh, cuu thanh
hoa doanh » toan doanh, hoa dan
sach hoi » sach doi, cach thoi, hoach hoi
khoa hoc » hoa hoc
cong hoa » dong hoa, dong hoc, hang hoa
cuu cong » cua cong, thu cong, cac cong
sach moi » sach doi, bach mai, sach bai
hoc mai » hoc ma, hoc dai, hoc bai
mai hoi » mai khoi, dai hoi, lai hoi
hoi cho » hoi chu, hoi co, hoc cho

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 hoi) OR (sach moi)) tap, nghien cuu cong hoa doanh khoa hoc mai hoi cho thanh van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach hoi) OR (sach moi)) tap, nghien cuu cong hoa doanh khoa hoc mai hoi cho thanh van".
• Adding a wildcard symbol may retrieve word variants: te ((sach hoi) OR (sach moi)) tap, nghien cuu cong hoa doanh khoa hoc mai hoi cho thanh van*.