Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, nuoc sach
hanh van » thanh van, khanh van, hanh va
su triet » su viet, su tien, ve triet
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
van su » dan su

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

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