Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan
thu sach » tu sach, thuat sach, thuoc sach
dang hai » dang khai, hang hai, dung hai
cua viet » ca viet, hoa viet, cua vat
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
va am » va lam, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang x ho. lieu va am ((thuc vat) OR (thuc dan)) dang hai cua viet~.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. lieu va am ((thuc vat) or (thuc dan)) dang hai cua viet*.