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
cau nhan » chau nhan, ca nhan, cu nhan
nhan dan » phan dau, gian dan, nhan tai
tu sach » su sach, te sach, tu cach
doi tac » dong tac
hoi cau » hoi chu, hoc cau, hoa cau
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 cau nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) doi tac, nghien cuu dong luc ngan hoa hoc xa hoi cau 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 cau nhan dan*.