Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien
ve triet » va trien
sach ky » sach y, sach ty, sach kem
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
thu van » thuc van, thuy van, tu van
hanh va » hang va, hanh vi
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay

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) OR (sac ky)) nang cao hoi. hieu va nam thu van hanh va ((su triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang cao hoi. hieu va nam thu van hanh va ((su triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang cao hoi. hieu va nam thu van hanh va ((su triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang cao hoi. hieu va nam thu van hanh va ((su triet) or (ve triet))*.