Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nham thuc » nhan thuc, nam thuc, nham thu
nang may » nang ma, bang may, nang cao
thuc ban » thuoc ban, thuc dan, thu ban
hanh va » hang va
va nham » va cham, va tham, va nha
hieu va » lieu va, hieu qua
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((nang may) OR (mang 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 sac ky ((nang may) OR (mang may)) hoi. hieu va nham thuc ban ((hanh va) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky ((nang may) OR (mang may)) hoi. hieu va nham thuc ban ((hanh va) or (hanh vi)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((nang may) OR (mang may)) hoi. hieu va nham thuc ban ((hanh va) or (hanh vi)) cua triet*.