Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh vai » hanh vi, hanh va, hanh tai
thuc ban » thuoc ban, thuc dan, thuc van
mang mai » mang may, lang mai, mang lai
hieu va » lieu va
mai hoi » mai khoi, dai hoi, lai hoi
thu ban » thu hang
ky mang » ky nang, ke mang, ky dang
vai cua » dai cua, hai cua, lai cua
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 mai hoi. ((hieu va) or (hieu qua)) nham ((thuc ban) OR (thu ban)) hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sai ky mang mai hoi. ((hieu va) OR (hieu qua)) nham ((thuc ban) OR (thu ban)) hanh vai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sai ky mang mai hoi. ((hieu va) or (hieu qua)) nham ((thuc ban) OR (thu ban)) hanh vai cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sai ky mang mai hoi. ((hieu va) or (hieu qua)) nham ((thuc ban) OR (thu ban)) hanh vai cua triet*.