Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tham thuc » nham thuc, pham thuc, tam thuc
thuc ban » thuoc ban, thuc dan, thu ban
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
hang vi » hanh vi, khang voi, hang tai
hang di » hang doi, hang dien, hang dich
sai ky » sac ky
tu sai » tu bai, tu san, tu cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sai ky mang may hoi. hieu va tham thuc ban ((((hang vi) OR (hang va))) or (hang di)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky mang may hoi. hieu va tham thuc ban ((((hang vi) OR (hang va))) OR (hang di)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky mang may hoi. hieu va tham thuc ban ((((hang vi) OR (hang va))) or (hang di)) cua triet*".