Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
cua triet » cua viet, su triet, va triet
mai khoi » mai khoa, tai khoa, cac khoi
danh dau » lanh dao, hang dau, danh tu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
mai hoi » dai hoi, lai hoi, mai doi
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dau cua » dai cua, day cua, cau cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky nang ((mai hoi) or (mai khoi)). hieu vu pham thuc va danh dau cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang ((mai hoi) OR (mai khoi)). hieu vu pham thuc va danh dau cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach ky nang ((mai hoi) or (mai khoi)). hieu vu pham thuc va danh dau cua triet*.