Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thai thuc » thai thuy, thai tuc, tham thuc
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va thai » van thai, va tai, va tham
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((nang x) or (dang xay)) hoi. hieu va thai thuc va hanh va cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang x) OR (dang xay)) hoi. hieu va thai thuc va hanh va cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang x) or (dang xay)) hoi. hieu va thai thuc va hanh va cua triet*.