Perhaps you should try some spelling variations:
sach duoc » sach nuoc, sach dung, sinh duoc
cuu tuong » cuu thuong, cuu tong, cuu phuong
tuong hoc » truong hoc, tuong ho, duong hoc
hang khoa » dung khoa
sach dao » lanh dao
hoc hang » hoc hanh, hoc bang, hoc tang
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan 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: tu ((sach duoc) or (sach dao)) tap, nghien cuu tuong hoc hang khoa hoc xa hoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach duoc) OR (sach dao)) tap, nghien cuu tuong hoc hang khoa hoc xa hoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu ((sach duoc) or (sach dao)) tap, nghien cuu tuong hoc hang khoa hoc xa hoi ca nhan dan*.