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