Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh vai » danh sai, danh va, doanh van
thuc dan » thuc hanh, hoc dan, thuc vat
vai cua » dai cua, hai cua, lai cua
thuc va » thuc vat, thuc day
tu sach » thu sach, su sach, te sach
doc loi » duc loi
ty hang » ly hang, ty xang, thi hang
ty nang » ky nang, ty xang, ly nang
hieu va » lieu va, hieu qua
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: tu sach ((ty nang) OR (ty hang)) doc loi. hieu va am ((thuc va) OR (thuc dan)) danh vai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ty nang) OR (ty hang)) doc loi. hieu va am ((thuc va) or (thuc dan)) danh vai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ty nang) OR (ty hang)) doc loi. hieu va am ((thuc va) or (thuc dan)) danh vai cua triet*.