Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
thuc ban » thuoc ban, thuc dan, thu ban
hang di » hang doi, hang dien, hang dich
hang vi » hang va, hanh vi, khang voi
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
may hoi » may thoi, tay hoi, may hmi
ky mang » ky nang, ke mang, ky dang
san ky » sang ky, van ky, dan ky
tu san » thu san, tu ban, tu can

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

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