Perhaps you should try some spelling variations:
suu viet » su viet, sau viet, sieu viet
hanh dao » lanh dao, thanh dat, thanh dam
van hanh » van thanh, ban hanh, van anh
dao suu » dao huu, da suu
tru van » truc van, tu van, tru va
cac tru » ca tru, cac tro, cac thu
hieu va » lieu va, hieu qua
tu sach » thu sach, su sach, te sach
may hoi » may thoi, tay hoi, may hmi
ke mang » ke nang, ke trang
ky mang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi

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