Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
thuc dan » thuc hanh, hoc dan
danh hai » dang hai, lanh hai, manh 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 lam » van lam, va lap
va am » 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) OR (va lam)) ((thuc vat) OR (thuc dan)) danh hai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x ho. lieu ((va am) OR (va lam)) ((thuc vat) or (thuc dan)) danh hai cua viet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. lieu ((va am) OR (va lam)) ((thuc vat) or (thuc dan)) danh hai cua viet*.