Perhaps you should try some spelling variations:
luc nganh » chuc nganh, luat nganh, luc canh
thu sach » tu sach, thuat sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
cuu dong » cuu cong, cuu tong, cuu long
luc ngan » luc nhan, luat ngan, vu ngan
nhan dan » phan dau, gian dan, nhan tai
doi tac » dong tac
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: thu sach doi tac, nghien cuu dong ((luc ngan) or (luc nganh)) hoa hoc xa hoi ca nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach doi tac, nghien cuu dong ((luc ngan) OR (luc nganh)) hoa hoc xa hoi ca nhan dan.
• Adding a wildcard symbol may retrieve word variants: thu sach doi tac, nghien cuu dong ((luc ngan) or (luc nganh)) hoa hoc xa hoi ca nhan dan*.