Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dao, sach dung
nhan khoa » nha khoa, khuan khoa, toan khoa
gian lang » gian dan
sach hoi » sach doi, sach moi, cach thoi
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc nhan » hoc nhanh, nhoc nhan, hoc phan
khoa hoc » hoa hoc
ca gian » ca giang, ca giao, va gian
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: tu ((sach duoc) or (sach hoi)) tap, nghien cuu dong hoc nhan khoa hoc xa hoi ca gian lang~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach duoc) OR (sach hoi)) tap, nghien cuu dong hoc nhan khoa hoc xa hoi ca gian lang.
• Adding a wildcard symbol may retrieve word variants: tu ((sach duoc) or (sach hoi)) tap, nghien cuu dong hoc nhan khoa hoc xa hoi ca gian lang*.