Perhaps you should try some spelling variations:
sach hoi » sach doi, sach moi, cach thoi
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
hoc phan » hoc dan, hoc pho
phan hoa » phan loai, phan phoi, phan hong
dac nhan » cac nhan, danh nhan, cac nha
vu sach » vu bach, su sach, vu khach
hoi tap » hoi dap, hoc tap, hoi tai
hoc xa » hoc ma

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach hoi tap, nghien cuu dong hoc phan hoa hoc xa hoi ((dac nhan) or (ca nhan)) dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach hoi tap, nghien cuu dong hoc phan hoa hoc xa hoi ((dac nhan) OR (ca nhan)) dan.
• Adding a wildcard symbol may retrieve word variants: vu sach hoi tap, nghien cuu dong hoc phan hoa hoc xa hoi ((dac nhan) or (ca nhan)) dan*.