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