Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
cua triet » cua viet, su triet, va triet
dang may » mang may, dang xay, dung may
thuc ban » thuoc ban, thuc dan, thu ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
hanh va » hang va

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 ky dang may hoi. hieu va nham thuc ban ((hanh va) or (hanh vi)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang may hoi. hieu va nham thuc ban ((hanh va) OR (hanh vi)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang may hoi. hieu va nham thuc ban ((hanh va) or (hanh vi)) cua triet*.