Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
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
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 doi tac, nghien cuu dong luc ngan hoa hoc xa hoi cau ((gian dan) OR (gian lang))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach doi tac, nghien cuu dong luc ngan hoa hoc xa hoi cau ((gian dan) OR (gian lang))".
• Adding a wildcard symbol may retrieve word variants: thu sach doi tac, nghien cuu dong luc ngan hoa hoc xa hoi cau ((gian dan) OR (gian lang))*.