Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
van pham » san pham, van phan, van phat
hanh lam » thanh lap, hanh kem, hanh va
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
x hoi » xa hoi, o hoi, 5 hoi

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) or (su sach)) thi nang ((x hoi) or (x ho)). hieu van pham thuc va hanh lam cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) thi nang ((x hoi) OR (x ho)). hieu van pham thuc va hanh lam cua triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) thi nang ((x hoi) or (x ho)). hieu van pham thuc va hanh lam cua triet*.