Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
dong hoa » dong hoc, dong co
cam luc » cam xuc, cau luc
ca chua » ca cua, sua chua
va chua » vua chua, va chu, a chua
luc van » luoc van, luu van, duc van
so sach » bo sach, co sach, hoc sach
hieu tu » chieu tu, hieu tuc, hien tu
hoa hoi » khoa hoi, hoa hoc, hoa doi
ky dong » ly dong, ky dang, ky cong
so sanh » do sanh
tu cam » tu cham, tu cac, tu nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) ky dong hoa hoi. hieu tu cam luc van hanh ((va chua) OR (ca chua)) tri~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ky dong hoa hoi. hieu tu cam luc van hanh ((va chua) OR (ca chua)) tri.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) ky dong hoa hoi. hieu tu cam luc van hanh ((va chua) OR (ca chua)) tri".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ky dong hoa hoi. hieu tu cam luc van hanh ((va chua) OR (ca chua)) tri*.