Perhaps you should try some spelling variations:
thanh chong » thanh chuong, thanh cong, nhanh chong
chong dich » luong dich, hang dich
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc thanh » hoc nhanh, hoan thanh, hoc phan
giao dan » gian dan, giao dat, giao dien
dich can » dich han, dich ran, lich can
cong hoc » dong hoc, cong hoa, cong coc
sach hoc » cach hoc, sach hoi, sach duoc
cac cong » cua cong
mach hoc » cach hoc, dich hoc, anh hoc
can hoi » cau hoi, can ho, dan hoi
ca giao » cua giao, co giao, va giao
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: su ((sach hoc) OR (mach hoc)) tap, nghien cac cong hoc thanh chong dich can hoi ca giao dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach hoc) OR (mach hoc)) tap, nghien cac cong hoc thanh chong dich can hoi ca giao dan".
• Adding a wildcard symbol may retrieve word variants: su ((sach hoc) OR (mach hoc)) tap, nghien cac cong hoc thanh chong dich can hoi ca giao dan*.