Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
pham thuc » phap thuc, pham chuc, nham thuc
doc sach » hoc sach, toc sach, dac sac
hanh van » thanh van, khanh van, hanh va
su triet » su viet, su tien, ve triet
cao hoi » cau hoi, co hoi, cao 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) OR (nuoc sach)) ky nang cao hoi. hieu ve pham thuc va hanh van su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (nuoc sach)) ky nang cao hoi. hieu ve pham thuc va hanh van su triet".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (nuoc sach)) ky nang cao hoi. hieu ve pham thuc va hanh van su triet*.