Perhaps you should try some spelling variations:
cac trung » cac truong, dac trung, bac trung
suu viet » sau viet, sieu viet, so viet
hanh dao » lanh dao, thanh dat, thanh dam
cac truc » cau truc, cac tru, sach truc
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
su viet » so viet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky mang may hoi. hieu va ((cac truc) or (cac trung)) va hanh dao ((suu viet) OR (su viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky mang may hoi. hieu va ((cac truc) OR (cac trung)) va hanh dao ((suu viet) OR (su viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky mang may hoi. hieu va ((cac truc) or (cac trung)) va hanh dao ((suu viet) OR (su viet))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky mang may hoi. hieu va ((cac truc) or (cac trung)) va hanh dao ((suu viet) OR (su viet))*.