Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
danh hai » dang hai, lanh hai, manh hai
thuc day » thuc dan, thuc vat
thuc va » thuc vat, thuc dan
hai cua » thai cua, dai cua, hoi cua
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
nang co » nang doc, nang noi, nang hoc
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 ky ((nang co) OR (nang cao)) loi. hieu va am ((thuc va) OR (thuc day)) danh hai cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang co) OR (nang cao)) loi. hieu va am ((thuc va) or (thuc day)) danh hai cua triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang co) OR (nang cao)) loi. hieu va am ((thuc va) or (thuc day)) danh hai cua triet*.