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