Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
thuc dan » thuc hanh, hoc dan
danh vai » danh sai, danh va, doanh van
cua viet » ca viet, hoa viet, cua vat
tu sach » su sach, te sach, tu cach
vai cua » dai cua, hai cua, lai 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) OR (tu sach)) ky nang x ho. lieu va am ((thuc vat) OR (thuc dan)) danh vai cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (tu sach)) ky nang x ho. lieu va am ((thuc vat) or (thuc dan)) danh vai cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (tu sach)) ky nang x ho. lieu va am ((thuc vat) or (thuc dan)) danh vai cua viet*.