Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
dai hoi » dai hoc, dai moi
dai hai » dai han, dai tai, dai thao
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky nang ((dai hoi) OR (dai hai)). hieu ve pham thuc vat hanh vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((dai hoi) OR (dai hai)). hieu ve pham thuc vat hanh vi cua triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((dai hoi) OR (dai hai)). hieu ve pham thuc vat hanh vi cua triet*.